Malicious PDF — malware analysis report

Static analysis result for SHA-256 433c5dc03f70a19d…

MALICIOUS

PDF

97.2 KB Created: 2021-07-03 15:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11743f41cebdb54e7d133d62e975bcf5 SHA-1: 2655f6e11b7a3264b39e6f2fc624c94d15eb2849 SHA-256: 433c5dc03f70a19d4025f009a93524f4c25a80ce2933ceda209701da81761400
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of urgency and callback lures further supports a phishing or scam campaign. Although no scripts were directly extracted, the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ozgu-yapi.com/firma/files/32819706891.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/46625877163.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/78e88bdebdcbe8117f614b429e6d0435/97488326631.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/dopekelifebifugodajojag.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ocslu1fsahhb4nfto0p644ahk8/65914620048.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7001ac05c4fe09b04e10c04a27eba97c/pomuzelikenuwowovujenim.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/59892986110.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/546197161.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6c215cfddbccae55d943ca6ea6769fa0/vokokolinuxebafuwebexejas.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/luxel.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b167dd397a0---duzelopizasebero.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/fotuzodexuduzowamugu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/80678729699.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/gexojugo.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/33692165121.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6ddbaa589d8461eb4b61a0d8e6c67c5b/pofizoresonem.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/21459182578.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c1e91e28531d0dc4eb912a623bd2cbd9/dekudimomoxobadorawidu.pdfIn PDF document text
    • https://ubranni.com/uploader/files/81070360835.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/u1pk7lhivtc3qfefqqjt9lmavr/27308541198.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d66197b1e80---1367684518.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/kewigepopumepal.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ee92f019---27593498246.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/68296854951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sports+quiz+questions+and+answers+in+malayalam+languagePDF 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_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 18000 bytes
SHA-256: 2bcbbf9668aee2f1fcada96072e528d3475c1f2b5df66380d391fcd802d7572e
font_01_sfnt_off000144cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CD 11316 bytes
SHA-256: f8dbca7e83eb0852575343f710f53652929a50bca6f38c157945d20903383f09
font_02_sfnt_off00015ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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