Malicious PDF — malware analysis report

Static analysis result for SHA-256 a058f5bbb5854184…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 09:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c70b6a128c1e5651dc353bbdbd362e2f SHA-1: 63d29a33e9e76213cfd419053476ac19205c38fe SHA-256: a058f5bbb5854184b393827dc284660e547c766e0e1ee22ec640394f2effdf80
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or 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 distribution via a spearphishing attachment. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://buren-kompanie.de/userfiles/files/wuxaxusibatitelukukezima.pdf In PDF document text
    • http://ibb-online.ru/f/file/99890754949.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9700a8b24---wunonozuzoti.pdfIn PDF document text
    • http://bienbao.org/uploads/files/80413768571.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/15899146174.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bd466g4rcmcd9rhmptqhde7ea3/21620324849.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/41111022519.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/78c5554e15f8c35f7b5e807e8c6ee11d/fojinizegu.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/17433682663.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/86611618442.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/321551848.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/66897346136.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3283b6d546---72618264239.pdfIn PDF document text
    • http://valeneighbors.com/userimages/bujaxovajipetogemixazuna.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/sedowasufexojetaroputo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b37d135fc7---nugovarunopivowix.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/lasikalofanixotazog.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e698eb61d---42212315406.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/81e3a2035fd9275a32978eb43862f302/zudaja.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/64405226881.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/19372906978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=starting+from+zero+fred+lam+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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 10896 bytes
SHA-256: 27045a830de69f1fdc4cd90ada5a3483b37aaeb334a6e0cda835b4ced52f224c
font_02_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 17132 bytes
SHA-256: 9eac7cf48d34c162b87dee30a64de8f947155eb2862ac7394796ec9a7f42659d

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