Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7803eaedc093d4…

MALICIOUS

PDF

90.8 KB Created: 2021-08-12 23:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7da72da8b1f9cb90ea3b35fabfb7866 SHA-1: f2b9ae78fa88563f17914bd896eb4a2db05824d7 SHA-256: 3d7803eaedc093d499e2f56f3688b8878da2cea5840b9b23ce28d45513e65d0f
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of urgency and callback lures further suggests a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure itself likely exploits vulnerabilities or embeds malicious JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 9

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.cavice.fi/tiedostot/files/zawedijudigozavivox.pdf In PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607399a8df83c---20441532640.pdfIn PDF document text
    • http://coumert.com/images/file/21486110596.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780533115c9---sejisujakadod.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/72650186544.pdfIn PDF document text
    • http://headrepublic.pl/images/files/fubafogubajax.pdfIn PDF document text
    • https://seerupit.dk/assens/file/40958494706.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e809e5705---mozijogaxiropiwapopem.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/bixelinusudibajanup.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/aefd0fdfadf7dcfd1f2dba0cafabd5a1/43939289543.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/31574214465.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/sumixopiripiratu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b0c2ea7a9---75410551526.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/xizedoledut.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/295adbd3b93c12a895df78c141b39bd0/tixexe.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/pematajikivose.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/5003945921.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f22869428f8---ragewabigekozomuful.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/suwuruwulopedamida.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae4c50d74---851679381.pdfIn PDF document text
    • http://momsystem.ru/public/file/begasi.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/bamovuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+you+get+a+covid+test+at+cvs+with+kaiser+insurancePDF 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_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 17372 bytes
SHA-256: f675f337f636ccc6ec4bdbbcd47f18935fb6087b36f2196040c447122306d937
font_02_sfnt_off000142cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CB 11092 bytes
SHA-256: 367459d3d054916df193af719dadd800af834fa547f296a0045d247ff1b8d7aa

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