Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a42b99b963737c0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 12:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc6e4d081d40f4884a58af88d444e57f SHA-1: 5c4f8ca81ff4c7e5a30e3b393546490d8f2164be SHA-256: 8a42b99b963737c0a351ec468cc28b1c2c1ae9268f79d745908a9c3c13887129
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or callback phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://albawadiroad.com/userfiles/files/74524088819.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb58e220b3---timenawijisetudopev.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/42930918039.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1610ccbfd1e4d1---wezijenoz.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/buzunajuwopadazup.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kb6ldlr269op0bec3qb88r0ihv/44979625426.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/moketira.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095789c4134f---vipebu.pdfIn PDF document text
    • https://majubesar.info/contents//files/votasu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5rd1rl5omafpgi5evd4amql0q1/43439541425.pdfIn PDF document text
    • http://bptramptour.pl/files/file/68038296714.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/21006492381.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b87fe48b0---84248179306.pdfIn PDF document text
    • http://chapelguild.com/images/usr/3186457571.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/af1f8010df3bb1cd99eff75cad5ca443/xevaxovipaxinenudoxag.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/77680699207.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/sozuwajapogug.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/gidimobozos.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/40086137121.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/pixivitolamet.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c0ae542ec---kopevizix.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/migedo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eca3e16ed---vubefivejozifi.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/raliwuwunarapisimini.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f73186211bd45807bb7ce511908c3de8/vudaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=homeopathic+bangla+books+pdfPDF 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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 11192 bytes
SHA-256: c86835eca9cff69a67e00ea825f1a0ebb36d93e8a98874e76c01ac5eace5cb29
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 17780 bytes
SHA-256: d25347efdf2e11e918f2ddd6b8ffae601d47d452d2bd2bd47be1ef88417f33cd