Malicious PDF — malware analysis report

Static analysis result for SHA-256 061f0247cdb382c9…

MALICIOUS

PDF

83.0 KB Created: 2021-06-28 19:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 576099782d9091f9dcaa2d35399cc7ed SHA-1: 4e8370c5d4360ac2a9d9cd8ae485b4cc56e81e2f SHA-256: 061f0247cdb382c9d33edf3f39d96ffa98bb67a8a148e5a74dc94ddcb8834773
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or directing users to malicious content. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=tds+and+hardness
    • https://atraba-holding.com/userfiles/file/fufabe.pdf
    • http://ingenermarket.ru/userfiles/34458291093.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15dd63e4f---gelejewunoz.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c201ac8c6e6---40637162642.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/82fe2de143ffb42be3e025984f439c41/72207446085.pdf
    • http://regmac.net/userfiles/files/10121014248.pdf
    • http://quickvideo.nl/userfiles/file/39016289106.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160908c94dcec8---nusixebebi.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071addd69529---29076210764.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510183535812574.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2d839842e1e0e4280ac2bad112027f43/faromukevidawim.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/23949931222.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e101f131f0---bogasose.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/33287270288.pdf
    • http://yonseri.org/userfiles/files/dorokavef.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abb491e9d48---48766753046.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b3260dcec97d52ca6101063dff6d7b4b/refusugagamebun.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084471cbbaca---40318623197.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec88b79dd9---mopivaxefopa.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/t3ogh59rfsup2i3sfuo0kqu707/13125973151.pdf
    • http://beergolfers.com/blog/images/file/21028703456.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d50845ae57da3b59942bba14442de2d3/nakeket.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_off0000e2ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 16792 bytes
font_01_sfnt_off0000fae0.bin
f10fd31a0f31fab7af013c4342f7908237615319e8aff2b1eb1f80f53dd5955f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 9952 bytes
font_02_sfnt_off000110c7.bin
5a0b243ef4268e5257d43561c17655011d100d8f8533d10701f9384ac668f4ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 17148 bytes