Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e656dec027cb1e…

MALICIOUS

PDF

98.2 KB Created: 2021-07-08 04:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b748ad364625af383cfb1706fe2b060 SHA-1: 546a7081cd5dc06831acd9a3b47bcc6d5db92f7c SHA-256: 98e656dec027cb1e76de5206f9ae706d228bc707a6ce90cd810ec0f02fe9cf9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users through a link farm to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/55112259193.pdf
    • http://antifftech.com/uploadfile/file///2021070805573484.pdf
    • http://colescastle.com/clients/875019/File/31379482729.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7d96266b95913bb6309531c4fbf99b37/gedol.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0673edd9---20293670114.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9ad5e2925b6438c151292da7f0dd0275/pumudata.pdf
    • http://abc-tel.ru/data/File/jijewililerivo.pdf
    • http://deauville.ru/files/file/84875487607.pdf
    • http://aldo-ins.com/userfiles/file/nakofede.pdf
    • http://proxima-design.cz/files/file/togesunizubaxofurunari.pdf
    • http://cp-1.ru/userfiles/files/53913031209.pdf
    • https://lescourailleurs.com/upload/editor/file/fuvujubixubema.pdf
    • http://tvkinter.com/file_media/file_image/file/24589406003.pdf
    • http://ghioroiu.ro/sites/default/files/file/7676418765.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f3524d1382273f38107594f7bafdcc12/94044472618.pdf
    • https://ymvii.com/admin/upload/files/44091002803.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b26c520f84---93558663095.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e1cce3ed2a10ff80dbfb11db6f378992/11309696394.pdf
    • https://boyanbolyarski.com/userfiles/file/33953393592.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a4898947022a50d0e7b61617c2506965/96111530380.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bef23993a58---52452184273.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9f334e566c131c29dc01a49c9b9d9fca/84113546078.pdf
    • http://pivotal-technologies.com/userfiles/file/fulujesubuwox.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/48482308018.pdf
    • http://diamondsnspurs.com/clients/12200/File/48760045150.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d97e3f4a594---sazudutexire.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+grinch+minions
    • 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_off00011b93.bin
94a99a9c9ef0578f401c64407b648962eb1f7e11da05db599a457f49f8fb8ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 17892 bytes
font_01_sfnt_off00014ae2.bin
5a74cb175e31a119c4568c862ab6b3c934c940532df7b41685403c6a966e5119
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE2 10332 bytes
font_02_sfnt_off000161f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161F9 16792 bytes