Malicious PDF — malware analysis report

Static analysis result for SHA-256 32caf6ba9549df96…

MALICIOUS

PDF

109.9 KB Created: 2021-07-02 00:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cfb090aeb805df0368e34614f4a0a84e SHA-1: 939d18608301df7a2cde23626f7eb9c8d5ea138e SHA-256: 32caf6ba9549df96fe51de7c6f7ee5c356fa469f65029c54be6d8a9796ead45a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URI patterns are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://eatorhours.org/e-bussiness/fckimages/file/vodozasibokar.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7116c66cce---80076730910.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/95e4285592f96c7f8fe2fca11676e484/moxuwemarobikato.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/506013bdebd3d041d7bd343fa0fd14c0/bukedalafajikuso.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d825821aed4---kedediwonuzofuzotem.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/aa115fe1b4059cccdd68e01d912f9280/depok.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1894e01b228f73836297751a7a97befb/42270761117.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uism64709nflh740bn85as2o8c/doveparotapasafuwefi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/02ba83e66c7ac3f61b47d147649a464d/31798606376.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3524f468---sivaxesetupatel.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/rarudamamekexer.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mdogm7sb3flkqnfd63gq4ptk6j/kulibisal.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/d83567bb36e605454ae63eb5f14e5d79/nunawiketabu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607d709a9bcb0---31410795154.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7g9nt638me13hc816dlrdjg1r7/60266827469.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7ca5c0963ff82592fc2427866b726d64/pigosetogigo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b371c0035f---lubikekaneripajajubejali.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c66101d31d2---wuvutipavajovakufixomov.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ee36adc7710499facf5516ceef183fa4/58653660617.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97d5805ea3---2243792172.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430145612410720.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160907f1568051---lileponifowowagudidawim.pdfPDF link annotation
    • https://duproject.com/uploadEditor/files/29785392207.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/koturifomumewixux.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/sivefudokaxozu.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/buredosujopajujatuvipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adjective+meaning+with+examplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 22772 bytes
SHA-256: 97357fc3ff0d7c722ea17999bbcf104fa7224fc39e3682cc393fefc0b6dd7a3d
font_01_sfnt_off00016326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3D 10936 bytes
SHA-256: 688fbdb30b40cc1d903eecc113abc92a5b4fb20f908e5a3d319dea8114bb2bad
font_03_sfnt_off0001942c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1942C 16188 bytes
SHA-256: 9d3a2c7f3cd7a845e425e22361150ca611a6b467aecbf2e15da520c4e09760d6

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