Malicious PDF — malware analysis report

Static analysis result for SHA-256 502df8a6adcfcce6…

MALICIOUS

PDF

82.1 KB Created: 2021-08-19 11:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52e52044dc851338c793d94a86388e8a SHA-1: fcd60508d697ca957ce85c3f729c9ca4e801c50c SHA-256: 502df8a6adcfcce69815553d7cb793d50bbdb560aca77e401b7ffeb7f5c5779d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, presenting numerous URLs that masquerade as driver downloads, likely to deceive users into downloading malware. The presence of multiple compromised CMS upload links and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=canon+lide+110+driver+free+download+for+windows+7
    • http://myjobcareer.net/userfiles/file/2021081710073273499.pdf
    • http://vmkmsz.hu/userfiles/file/jipomulonow.pdf
    • http://namuvaldymas.lt/userfiles/file/tuxajakoxemenikeramegin.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4c99fa7e---vevudukirufepijoginivof.pdf
    • http://www.tobywells.org/media/fckdir/file/90446119752.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161032a8b584a0---bukijolilobepa.pdf
    • https://aitalk.vn/upload/files/wowakewibotikemito.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/de8264b4fcd22b1adc08840457f49d1f/82132007484.pdf
    • http://adria-ex.com/images/blog//file/kijilovazofuni.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e7ed3bab6586f2efdf68233625669f06/1426133095.pdf
    • http://sllight.ru/design/img/upload/file/89485730822.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7d8bd721f434d1764d967e06ab49874/1802940532.pdf
    • http://eltonltd.ru/sites/default/files/uploads/witejojeweg.pdf
    • http://linkingpeople.info/userfiles/file/ligofexiwipatorusavod.pdf
    • http://fecirturizm.com/resimler/files/88459702684.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa88d4d71---lamepesugonedaxadexefomaj.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ruvmv6tr790mjhhab5oo1c2upd/bisanalowamekezixifigog.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3d4e447a---1845583548.pdf
    • https://citronel.com/userfiles/files/27055240699.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3399aecf---99275733050.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61959155e---25760674983.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1dc7d2bf5ab843e4e1095d6edcd8c4c0/fusulokojugedogu.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_off0000dd73.bin
e9d457ad4f8a73bedcf9df5bac85b826fd2d41f7a7bf8c785d421f7654538f6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 10656 bytes
font_01_sfnt_off0000f61c.bin
fde7b01449d888ecca088fe2ce5ee14a7cfce2f599ce9c761e758907bbdc9488
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16656 bytes
font_02_sfnt_off0001213f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 16792 bytes