Malicious PDF — malware analysis report

Static analysis result for SHA-256 c504a3a2bfed1bc0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 02:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9312f6c8965b8a752031bb32983b958f SHA-1: ed1a9ab7b6b18eadae2a5d3eeced8d8bfbd66dbf SHA-256: c504a3a2bfed1bc02217f7086de6d9b3a18f4eaf59504b1f9d5be2ed4a4c4553
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a fraudulent number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=unemployment+sd+weekly+certification PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7548657e3---wesibesurisofegozaju.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/vawulole.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c76bf8cc1e1---netederedosojifox.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16119a11888804---29444426465.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/bewigejowolujikunizeson.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ef69fa96---renemuzogipobitonexamola.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/62552900856.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/772bdb087ccb6d5c3baf4a554afc49d2/retovugivaju.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/33647172768.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160760aff7810b---jawetenonabufokot.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/47182796210.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7454723e---jogozazid.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/af403428cb07dd117dea0cb42e961a7d/gufamapezodunevugi.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/lavatalijudan.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/s662ev9e7u6rt83f580htv8tpb/13062792011.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/26154315201.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a5256415---78625072886.pdfIn PDF document text
    • http://candientushinko.com/images/file/49115454198.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/roruxavibuved.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nojafidefeke.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d591776c1664375ca17575fb1bdd154/leluv.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e7d951ffc4c769903874a8cade6a9a0e/15032333644.pdfIn 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://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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 11080 bytes
SHA-256: e1555a35b18d53de7e88ce79f97050b23a434e0c47e949a0c980646832e30ba3
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 17936 bytes
SHA-256: f42ce8174ec08e0d20bc9c4e3ea3cf72818f1af1845d2cba058ee8497e242b8d

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