Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf4647dbd6ccf19…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 09:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca7639cad1eed96c16924a31f2c8dddd SHA-1: 236a33b1e1b4b463b04db0f010cf52ed2281dc61 SHA-256: 2bf4647dbd6ccf191b04afe2588b866ea4a892c7f7f3cbce260baa2b938cadd3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://majstrissmt.eu/www-data/file/levoxaso.pdf In PDF document text
    • https://zweefvlieg.net/userfiles/file/66686250944.pdfIn PDF document text
    • http://wenxuezj.com/images/File/44757924578.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/xirixixesofafulunok.pdfIn PDF document text
    • http://hevolta.com/upload/file/16946110383.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/putuzinuzozorar.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/3402260881.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eb8a8bcdc---13615267757.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/gevinisatexedazanivu.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/muxigu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/00dd46ba43b29559bcf59bbcb25d64a8/gapomoj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2000e2dd7---86932261941.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/09bbc2418a927b3abe74957357cf4291/41154574693.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/79325581892.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cc4579195737b6ced25d52e020779814/sotokarol.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d74b04371---32380396597.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18363261776.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160797b6c52e28---38727592591.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/53953601596.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/rugujapabebevozobebutajix.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/k6eqt67mllvot2ht950m9572mq/39074473769.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4565b71b5c---29867839071.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xijekutesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pathways+2+listening+speaking+and+critical+thinking+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 15132 bytes
SHA-256: 6c3da4ae4c8d32e96218293f01981802d106b6051bffb09bc405e8b28b9abf0b
font_01_sfnt_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 11312 bytes
SHA-256: cd104ac7ad2c6fed371899aad218f105c19926e21948ffe81cba4c966ef74276
font_02_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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