Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c657fc4299bf69d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 11:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a065afec1a2c6cce9efa3173f85ab896 SHA-1: 9ee2c095b75f6de21589b89d978807f68d00e3d6 SHA-256: 9c657fc4299bf69d5851517cf8eaebb4464e616b27ad46de4384396348867697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to malicious content or exploit vulnerabilities on linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=example+of+targeting+in+marketing
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/eb857b9390db84670a0e80afbc86b0b4/toseligegonin.pdf
    • http://sgyscom.com/upload_fck/file/2021-8-23/20210823141119772364.pdf
    • http://chupanhnoithat.vn/upload/files/6485193399.pdf
    • https://actorconseil.com/files/file/12081517849.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160874c8bab3fc---zikefibuxopubofib.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4e3c7b010c7a9a6f85b47c122ecb0296/kivejejapu.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/61230051828.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2501c701a173910def81deea783b4bcc/wutoviteneg.pdf
    • http://sistersaviopublicschool.com/userfiles/file/8976085079.pdf
    • https://haysalon.com/public_html/userfiles/file/67023881949.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb88892dfe---28018406473.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/mabagetewiji.pdf
    • http://bsbcarpet.com/userfiles/file/15823721633.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/326f7f384881bb205adf90d5de9acdc0/16161646982.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3a140236---87923856453.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1625143779.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///34137483503.pdf
    • http://iviltra.lt/images/files/86170012850.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2b4d46376ceced9caaea6890219874c4/buvenimujevubuloboju.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/6kg265gop5jov782q6mss18ig5/rezun.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bb278f084---30499331012.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9608ad4c1---51589197384.pdf
    • http://banhangcongnghe.com/upload/FCK/file/799272635.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c85020fe---mubelekisekivodipodider.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abae9ab4e0d---tiwotulomana.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_off0000e39f.bin
75912fac1e1c4abb47111d76bece66af1d356180bf106ebac49b83d951b53e21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 16296 bytes
font_01_sfnt_off00010d9c.bin
bec8f75a421a245cc274cfe107d45c17b855aae5c22a114f1f9ce399a1fa9681
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 10708 bytes
font_02_sfnt_off00012627.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes