Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e86c89f1c34768…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 02:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bbbd6504be474c068788eddf7583f85 SHA-1: 53994c02666b874c3f86d549dc05395f420ee6f3 SHA-256: c7e86c89f1c34768ccbabddae0d53f603e163a4e0e9c78a0e90432921a38b004
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on low-reputation hosting, often with UTM parameters, suggesting an attempt to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=crackdown+3+couch+co+op PDF link annotation
    • http://chukgoobok.com/files/fckeditor/file/30595211705.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/82794213515.pdfIn PDF document text
    • https://melz-feu.ru/upload/1658834536.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/nifojaxobevoxemiku.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/83200721735.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/33353473594.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/rusorajisejafejuki.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/rijatonusapefupagab.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/mekenowowufibenixax.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c8cf608484a82956b267779cdde27dd0/67602967350.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/34273572730.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143936529ebb---kuwodigotowefodag.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161349ad21234c---sujivovofeloxad.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zitoliludejonixat.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/62917541835.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/62234418983.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142afc799d0f---misina.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/laxijeduxopusumixusumif.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/63672658750.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/mabotoviwuxe.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/foxulokasomiwef.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e2228614---fojaxoberef.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/zubosiwapiwifujefovavum.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/xokipitibixafoluwez.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13D 17152 bytes
SHA-256: 942186a25f74610658c0f81f1f83839017369b242a7fe501323e89ea40815f5d
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 10556 bytes
SHA-256: e2b29bb2629b56cacd72522862bc78dfd60173fa680fd75b5338b91c9e33138c
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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