Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d99d377db0256e…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 14:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7602c727a96054f3911734680bb8173 SHA-1: 26411484d557f5cae5776a9eef24dbde666ab79b SHA-256: 11d99d377db0256e7fac4e5d7472eea194af37fff911b57aa99a0407037cc249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely designed to redirect users to malicious or phishing content, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/45dicbfkker8e2bofqk0uk1rm4/xonekaneninasibabi.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/7692233168.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5833abcbe---17136288902.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16081078a0767b---nabuxef.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3bc6bcee208e8448b7e99709a949fda2/rinukopenofezupoli.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tj4d2kk2kgjamrkojhdl1e31u1/bijedogo.pdf
    • http://otvorene-srdce.sk/userfiles/file/51459762601.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/040411f9e8dbef5366e7812899919c44/66473591760.pdf
    • http://nusratali.com/userfiles/files/fumivawapaxowufenitewaga.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dpg0akfhh8u28q49k0cui7hhck/97229653876.pdf
    • http://al-bandak.com/userfiles/file/63397606112.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/milpuumcjmdsfdflkfmbsdage4/94152084394.pdf
    • http://etpatatietpatata.com/userfiles/files/55725406029.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5c4ec4c1---19588756576.pdf
    • http://sosnovgeo.ru/userfiles/file/57037143154.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607103b41b624---bawiw.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9d63e300de262b470e9db1ae7903477e/89047523649.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823ef8e2057---90553639849.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a84133c3ca---41978764026.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d654d029057---ludivofe.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703e1202821---89633109830.pdf
    • http://dtcguild.org/clients/80367/File/topunamixaba.pdf
    • http://nexxosrealty.com/userfiles/files/bevowarajerejat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=risible+in+a+sentence
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d653.bin
83cb6e4faddc910705ad47ad037685d854d449e9c037b8a2fedbca4323eedcad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 16100 bytes
font_01_sfnt_off0000eba1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
font_02_sfnt_off000103b8.bin
fc1c38de9921e13894478ba01269f7e52f597762744d0aa74d252a871af00078
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 10188 bytes
font_03_sfnt_off00011aa6.bin
b15b92f72268511a2dc989c55d1a8b9d24a086eb0267906cb44f445c67184d57
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 21132 bytes
font_04_sfnt_off00014fed.bin
1c60ba816c6f32d257e9ea0c795b02eb468456911a42da6952d68be516a8bc14
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FED 2256 bytes