Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b13849a9cb304ec…

MALICIOUS

PDF

292.1 KB Created: 2021-06-14 05:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 20e222d3bf78567a825e25de303346e4 SHA-1: 35627fed3211449fb27665399ebad927053c9296 SHA-256: 2b13849a9cb304ecb2486397b91f30e84a78ecd83882a500085af145f976840f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=econometric+methods+johnston+3rd+edition+pdf PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/16e208734e7e8f7f2dd447e4bc36bdba/kejakikodefove.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/50785388a5d9f1330332d9ad3a1c994d/59729844450.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/veruzupali.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3cm9bs71ilv8ksmjium501o9go/totapase.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/dceb1ff05e3f614fae922e4c92899423/zafitotolirur.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7edfe3af6---wexufagosexexenore.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3cf3052749cfd475193dfefb36fc8526/rotimugejivosov.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/gerida.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b049a0cbbed---gojusewatefiwidezoba.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mizawimilitujaxules.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b325d778c9d---lixigokifi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609908d51a309---49060502557.pdfIn PDF document text
    • https://bem-sa.com/img/file/jezefexunalivof.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/buxugimomadisixi.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/54811208776.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160857dc751722---35230175886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004452b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4452B 5352 bytes
SHA-256: e0a2faea4f0779357da1e28c1d0a874a70f118bbc504b7fec0252bc781bc662a
font_01_sfnt_off0004573d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4573D 13096 bytes
SHA-256: 248f6d131c685c31d9e21cf857afe609f7b8165b9a406f0f2a5b657a9d5a907d

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