Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa51fda5bc2fdb2b…

MALICIOUS

PDF

106.5 KB Created: 2021-08-14 20:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d5bcd3022c465bf6f2ed8492108fd99 SHA-1: f11bb050638205920dc07e70dfbceb5952a65233 SHA-256: aa51fda5bc2fdb2bed959af80f2501c1b799eaaa42a90ba84ed6f9064eece821
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://sasalidayanisma.org/uploads/file/xazutodonamoro.pdf In PDF document text
    • http://discus-rus.ru/upl/file/godurosipopajejoz.pdfIn PDF document text
    • https://highrise.pl/file/fibisegukemiw.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107180343353075.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a371f6cdf02---numerugisowemisodozazume.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/purakikozovup.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vmoafiprtp1pjb17mgc3ds1od9/vufifubovom.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6aba20d01992d5341cd7e6b4edc815ce/61198142542.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/sagijobelinetedofapuza.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/42212848293.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/paketejinopenibabasij.pdfIn PDF document text
    • http://huiking.cn/uploads/file/141748354774.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2vbuho1c7gg41idhkjug68utfi/40653271153.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/57125353813.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/81655235350.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/pegoxadozeda.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/37282334372.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7100f986---6709673723.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kixenameleranilabatorex.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f80a3b69d---ruvoketararixukig.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983961ecb82---kuxusabigo.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/57742660037.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/84953724429.pdfIn PDF document text
    • https://naoshima-habitant.com/17205610004.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/6339ff1918913541a6e7892c743e99f3/55272678348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fifa+21+coin+generator+ps4PDF 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_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 19588 bytes
SHA-256: 900d689f8b7e4338eeb112cc0f1d32e1500d34fc115c03f483c1e852a08aac56
font_01_sfnt_off000153b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BCF 10836 bytes
SHA-256: 9bcae14a314c3c570065aaf7c0c4ef8ad24d9e3ea4a73f2b41a407076376425f
font_03_sfnt_off00018519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18519 16280 bytes
SHA-256: be851b298df7c3c9d2daf20623ae38acb6a52fc53d8fe81893fa0ee80d61d9f2

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