Malicious PDF — malware analysis report

Static analysis result for SHA-256 492fd84cb94fdbc3…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 23:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c2073a683c924473347d8651a5fe421 SHA-1: 643ece631244b1054a06e1318a1efeda587e2964 SHA-256: 492fd84cb94fdbc37d6f974fc7ff78aad5f779c5b6232e62c402c16cb1581d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous external links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous links to potentially malicious or compromised sites suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=in+depth+palm+reading
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b27d0cbc---fusokinokokepin.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/56204835526.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/843a2156f9ac936705c267793a397fc4/23046575891.pdf
    • http://hacoauto.vn/upload/files/11658219426.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jotatamogage.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608abc599a57b---94101447008.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6b92024edebdaf65943fa249cb4e01c8/34372580791.pdf
    • http://paoladebenedetti.eu/userfiles/files/wejedoruvuwugeropazawi.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7ff6c7d7---gologotov.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210529205349.pdf
    • https://equantumconsulting.com/files/files/famivogaz.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2f04c3d514d8809a38e551885dd72a94/gogazosule.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f484784f769759db7eb3d6e3f62683f3/5242309662.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b9f4960d4d17aa9613643cc127419db1/sawuzazinivakabedoduxib.pdf
    • http://tryinvest.eu/userfiles/files/31995020774.pdf
    • http://chronocertif.com/userfiles/file/favujafilumupi.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b5af75309824d51562bd8d6286ba2e46/79690546151.pdf
    • http://sam-global.info/files/file/pebew.pdf
    • http://studiogiovannone.com/userfiles/files/tonigama.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mjh3jt69k0dflgi7snaloi84a3/7927875421.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7ebb7ffa3aa5dd13d3b66fc87fb07730/xulow.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc728d08af---58290645731.pdf
    • https://isleo.com/i_photos/file/dapinijil.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c963de0e4d0f22e40945f5d4138cdbb1/8942936135.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36d.bin
0143e3df50dac4a2d96cc90fae4beaa768e4f8de6e7adf9691002bed4a36a9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 17096 bytes
font_01_sfnt_off0001201a.bin
0e2b6ec2964fe2c355251c1afc7eacbe86a703d1a93840fa071d3d3bd6647428
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10500 bytes
font_02_sfnt_off00013778.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 16792 bytes