Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e5f4a1debf13b0…

MALICIOUS

PDF

88.7 KB Created: 2021-09-04 07:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22c61fa0b4bc526569a7f1029d34cc62 SHA-1: eb4f0735ba9b8a47a2fb747b6e63b243422474f7 SHA-256: 74e5f4a1debf13b00a2e11ac0508aa701c3d4e6fe6f2a688b3dda01fc16d05c5
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDFs hosted on compromised websites, suggesting an attempt to lure users into downloading further malicious content. The presence of multiple compromised CMS upload links indicates a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://abwva.com/uploads/files/65305892258.pdf
    • https://dollarplus98.com/images/upload/files/ginikigonabo.pdf
    • http://kovacsoltvaskerites.hu/images/file/7731739583.pdf
    • http://enidental.com/userfiles/file/20210809175540.pdf
    • http://pasaru.com/upload/files/vepividavizurulowo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5245bb9e5b---tovefezisamenutonaju.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eba43bc72---44341150339.pdf
    • https://ajitcoatings.com/uploads/towolifigok.pdf
    • https://contabil-fiscal.ro/mm/file/pafowagaledev.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160868f6544b05---39797512826.pdf
    • https://takipbizde.com/calisma2/files/uploads/27716025655.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/kinijupafujakivopet.pdf
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dotetozapadopatoga.pdf
    • http://amphorabeautyclub.com/campannas/file/49436878358.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/cad540d88ee1a93ed20117a9fc91d716/4770119707.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b24d047a88---sarajuwegubo.pdf
    • http://air-ned.com/uploads/files/5045835103.pdf
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/xulinamarimomiz.pdf
    • https://karinbentum.nl/uploads/file/nebawalaveg.pdf
    • https://cncostruzioni.com/userfiles/file/27888033148.pdf
    • https://beaszemin.com/files/teminafubakip.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/sogitirugexerexut.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f32dd3f2b---61830392267.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea900d84e2---85337514699.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=irving+stone+michelangelo+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_off0000f0d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 16792 bytes
font_01_sfnt_off000108e9.bin
bb41e8ba4fdaa13024534d4bfaac6dd7df2c5a6222876e7f136afc7ce8bb7100
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 11084 bytes
font_02_sfnt_off00012258.bin
fcdbbf846bc01a62631beb0b0fe7a8cf5bb73583ca089fc66643c2daf5c3ca08
pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 19176 bytes