Malicious PDF — malware analysis report

Static analysis result for SHA-256 b085540ed9d7aa97…

MALICIOUS

PDF

95.6 KB Created: 2021-09-04 19:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1293a1187217f3329b0cc5aee5499b00 SHA-1: 95dd2df92c9db773531e445a3b8ad88e73167029 SHA-256: b085540ed9d7aa97663d5e1e0f050209e5c4599ffed0d8fad741acfbed8f6a99
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608561dbef7f7---wekopamuveguxow.pdf
    • http://hakkabrothers.com/userfiles/file///zifenidaminavoriv.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3416832750109b023951f795f12b13ee/mazofavimewamuwowosisaji.pdf
    • http://dotacjedlaoze.pl/userfiles/file/ganasasepopixajubos.pdf
    • https://skinrepublic.vn/webroot/img/files/guxogowiwa.pdf
    • http://graficaeformazione.it/userfiles/file/xaravovuturup.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093cfc2dc7da---pokafatukebinutarej.pdf
    • http://alkanboya.com/files/file///fojegigoj.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04957e790---84312513144.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e5386ec275d60fdaf4b15d99501b633f/sebojiba.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/68e674f5352e71df525b3155998b046f/44605606672.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/felasuzizoga.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079145828e81---79124372479.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/bef3f8a919c7962725e3fdb3782eb3df/lekalaf.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607505db48e9b---ziribivonufimaselafij.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b56a7c9568d67ad8768dcdf3d5fe3a58/fulovajibizejuluruvu.pdf
    • http://sevinctekstil.com/resimler/files/sojagelu.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd1e13cf1---vowisik.pdf
    • https://lapalettedesarts.fr/gestion/file/45453388737.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/degogotoginaga.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/boraw.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7606c7ad---95635513394.pdf
    • https://arab-hams.com/Ups/files/xukob.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/lugubevexarigoba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=may+day+eve+script+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_off0001113a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 16792 bytes
font_01_sfnt_off00012951.bin
dc183db7615a0f4574a20dbece25f0d631360eb98fbc1d2ddad311f9344bfad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 10516 bytes
font_02_sfnt_off00014164.bin
f47aea96a1bf4fb1a3c8f327ef5e7cdc7a910d3afef29ec8d30b22955b40e571
pdf-font-stream PDF embedded font (sfnt) at offset 0x14164 18204 bytes