Malicious PDF — malware analysis report

Static analysis result for SHA-256 97da2cf940af8cbd…

MALICIOUS

PDF

78.5 KB Created: 2021-06-28 22:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c38df9bd531288c63f7ab266adf504ff SHA-1: 801e105a7034ae391903cd70bebbeeaa99b8cf32 SHA-256: 97da2cf940af8cbd8c05748f68e206a48f9667f97261a6deba2fcb1e446c04f9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it is a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The PDF contains numerous external URIs, including one that resolves to an IP address, suggesting an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://baaningdoi.com/file_media/file_image/file/70800028867.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a5a2a01368a41047b59cbe524e0e181f/38544895165.pdf
    • http://asfus.net/virgsurv/userfiles/file/4739874031.pdf
    • https://davaocarrental.com/images/file/mafelasifulezolufob.pdf
    • http://amdind.com/userfiles/file/jipisebeva.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/15290281520.pdf
    • http://phuvuongcorp.com/luutru/files/talom.pdf
    • http://apvn.info/userfiles/file/95900737624.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/88e6dadccf2eeca026b238b016724b93/vimigodemeregubegopomab.pdf
    • http://aliceinformaticasrl.com/user/pages/94690560956.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/pokozuxe.pdf
    • http://157.230.241.115/image/upload/File/26792794666.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836b5c7e008---5623909025.pdf
    • http://seoulsquare.com/userfiles/file/tukosotenukabenorosawafu.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160769de6cc884---kabovefawoxotawe.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f9a63518470800fdd0b189da2850892a/40203607758.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609841c1d6f24---35033920721.pdf
    • http://megaprestige.ru/uploads/files/ripizej.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6d134030---35745909403.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/52bcbe6547b4e10e304226d96233fac7/lekolozek.pdf
    • https://calmoinc.com/upload/editor/file/93916025956.pdf
    • http://arcomproltd.com/userfiles/file/407464193.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=anterior+labroligamentous+periosteal+sleeve+avulsion
    • 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_off0000d00d.bin
c37f232d3fa6d6e42ce977c1f2832c6c6f68b81b2629ee9479c47baf547c68a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 10884 bytes
font_01_sfnt_off0000e90c.bin
0ae58c40193f8c644f3ec82e3d18d784d723319682306891e611837735e2c23f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 16580 bytes
font_02_sfnt_off00011471.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes