Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9f4ba628f064d7…

MALICIOUS

PDF

81.7 KB Created: 2021-06-08 03:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 197a3b386b9e14d17bb3ba0cd8ce80ac SHA-1: dec421decb993e8bf4474577ea16fe4e111c5a47 SHA-256: 8a9f4ba628f064d7e07d8351c93c5003a550feff737b0bc9bf2f5c103cff8e9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=el+evangelismo+personal+myer+pearlman+pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3507afa48---golarikanolosibojoju.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/94c14f24975f7d853cb52dcc34c22d79/38667874313.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160886aa669569---54087649463.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01cb92235---96758074242.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc7d7a5e5c02f95ab521cc4aa2c1f6ef/kopabopusuvirujem.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/a1nt1gmj1366mdcr6prpav50ml/kapulopudu.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qo1c8e92h20hjlruqk2u90theg/80284387254.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d7bda2fd0ddd45c7c3c34c23606cbe4f/12283872416.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d5d6bfeabaebb8b7e61331bed2986d85/24210505579.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965166aecd1---kitokadarofovozid.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe03e69ab---xidaxufiwizibukonudar.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p1k7tht1jekqlht8uhmvd64fr1/99065456549.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/86583993496.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vtmss25pnqdseiq1rfsgvhvcmo/27341385785.pdf
    • http://guides2alpes.fr/uploads/file/87217025091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010091.bin
72a304cdf486340a95f0f2ec3abe665b5fceb54778e909a943ad3fd1cbed3bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 5480 bytes
font_01_sfnt_off00011334.bin
63f8a33a05bfd5e84d77939e610289d2c597bf17f21f2f5762e103f52367a705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 11968 bytes

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