Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4ef30d9373e591…

MALICIOUS

PDF

126.5 KB Created: 2021-06-27 12:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 020c896b0312c6665ded0ec0c7920e1f SHA-1: 8b6fb71eb7a52f33f2715fb05520c027b7e8e942 SHA-256: 7f4ef30d9373e591d6d9b88ea9f45c432fbf82a62ae27a4afff06d6335a764d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f5651ceac28b133ab1f67d57dda0ffd4/90445861004.pdf In PDF document text
    • http://circuitoinsulargc.com/documentos/file/7876547839.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ovmlfbf3iikrbjqrug98l72pr7/30445075522.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1d291c1875a00873c89e3d61849b7c08/47797377501.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/68986118045.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jkp4e8p0gdq5v09bq74ses5qo1/71071480101.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/94689691098.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8be4f209---duwedodi.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/nopiwururi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0884c009---galimubusaxizusejikoda.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b4r6dcdap7n1ss73tl4pjmrdj0/nelisawavonopen.pdfIn PDF document text
    • http://capital96.com/userfiles/file/gepojowujefemito.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b369a5fc---38795416064.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/kifizaw.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/mazudisigepazuriv.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fjv5f024oj07e68j2rdrcn1l7d/15701134033.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/47691188591.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/22796399548.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/92006030647.pdfIn PDF document text
    • https://digireg.nz/upload/jolenakarevadimasezowomuz.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/dewedejefegoji.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2gin0pmgselffvr6gbveinopd6/mozanixomifireb.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/nopufepabiraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=visible+and+invisible+church+pdfPDF link annotation
    • 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_off00018bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BF3 10776 bytes
SHA-256: c82ae615990a18d0337f3d189b187d1bb9bf4428afff66778dcbe6b3d9359d60
font_01_sfnt_off0001a46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A46E 18376 bytes
SHA-256: ef99b61bb297f654f1c9af980188d25c727155ce34082e4f1f1b917307ee9400
font_02_sfnt_off0001d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1