Malicious PDF — malware analysis report

Static analysis result for SHA-256 db195f2669c45096…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 18:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05bb329b5a1c7df29f39486af9cf17e7 SHA-1: fd825841962d09cccc2d2d3a66ef280081ccb958 SHA-256: db195f2669c450969bab934df6544e07c655867341a38cf6699757f6d70bb047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document's structure and link distribution pattern are consistent with efforts to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=wagon+wheel+ukulele+chords+pdf PDF link annotation
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/vkh1mjlg2inkf4bgefb9cdaki7/77789001220.pdfIn PDF document text
    • http://fullx.net/files/83710843116.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/sixojolonabuvataxikexe.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/abac9144ae7cf0e30436dd22c2098a8f/8156490522.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/wawidavojokukuwiwo.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/nolojixajapavepej.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210619_7FA1977846A8B410.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/66e4fd892967bbb7ad90263928e56293/19368325852.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/gikuxezatosos.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/35bf7600e0e05d6f744cb1fa7f09e364/wirivipo.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/folarevefowavapelazut.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/mowawiritewag.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c500aa619e2---47154208568.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/xamegazofowitox.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/97404502884.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa614b964d7---kesinenepaxivodalisuboj.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/kerafanisuw.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/71815253009.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/xogudekedimune.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///kamufe.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/5dad1bcc5e190d54a5b01c0bb3549da0/30485537514.pdfIn PDF document text
    • https://menu2uplus.com/images/file/dotipowafop.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/dusomuniborejavotoja.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_off0000d2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BA 18536 bytes
SHA-256: 3003af24cf9429e98ac78043b15062ff8401def408070fa9b5d3e65fb7065b9d
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10980 bytes
SHA-256: e11494a45c59f4f1af90576417fcca4a1af5b854d1deece26035fec5eab05587

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