Malicious PDF — malware analysis report

Static analysis result for SHA-256 562c9d12c943d409…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 04:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 764b91e514465ebb5276dd789a152f43 SHA-1: 32f0e7f45028bc7f25966e2ab53eb0e847db4c19 SHA-256: 562c9d12c943d4097ccfc2bfa9180c0c4ca6b56817b897cd701d994eef23bf2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=when+do+i+need+to+clean+my+septic+tank PDF link annotation
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728b04cead3---17267471637.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tupoxo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9b8ca29254e2907217292a355f7eb8e9/zarepuwijawavasunakove.pdfIn PDF document text
    • http://cecev.com/stockages/files/gitepefileniburus.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/gbn5nrnt4374ccnakuugtpbmn3/28974479871.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/dcsl2lehogfr0o3kkqt95latno/80440489575.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/48567562985.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/87658488232.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/52556149691.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/55572663942.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c068269f514---43143809104.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9d260bfa059a64f48f1af22399177b4b/vakexixu.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/93021838255.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/wijarubazusawizujuxa.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/tubuvifulagisugazefog.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nibazatasina.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de67c67555---34686839043.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/sidanefuf.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/40421415743.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/gewetejukud.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0396514cad91fd313c0b709515f727f8/gesufemovugigedonuk.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d482a7525b---sigaxerudipasob.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/karojimuzaxedik.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/64027227062.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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 17024 bytes
SHA-256: f297622323c3bb8df9f55aae9d083203a7776d29d8fc83d613df1d1d0f88aa3a
font_01_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 10880 bytes
SHA-256: 89c1e55d14fbb428a0411777cd2e588491571ecc16f37b4db877b94354cedc6d
font_02_sfnt_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1