Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ef273ac5414698…

MALICIOUS

PDF

102.3 KB Created: 2021-07-03 19:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2d74e5d70eff7854d52d366753422dda SHA-1: df16f91c918d25493865ffd80d2c1ab66d6fde84 SHA-256: c5ef273ac5414698aa139910a288e3cf0797e3a819ad3e89a9ffeab4c92c6566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to mimic search results, directing users to download other PDFs from compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure for further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=gandhi+and+anarchy+pdf+free+download PDF link annotation
    • http://hytechplus.com/userfiles/file/69647307431.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725dfa818ed---90686706786.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/139c422bf5562c9d8e43dad9174402c8/dakolawujetiwib.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3c4775679487341ba69f1d049304cfcc/fokurufezumi.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/xejuwi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb9db81d1---50743963082.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160766564716d0---15873532670.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d173cb8853---41166899090.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/32435548381.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c0e750ad---vefune.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/mejakutamolu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ca2dc685---25799663526.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/050e4bcf5566e7ca3fab71bdc692df21/77028692504.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1bbe7ed22b6833ac0157bb8f1775ff53/fipunakamemafop.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/31023234829.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160809269a1b91---40018940110.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/p1mig2l9vpbi3dbkim1j9m3shb/50676226517.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6bf4e731---53842300468.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/1va8rh1ci7f37qrjl97pl86r3j/rejitoxatuposigiguv.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8ce843d3777a0186b3b77ffad37aab8a/96206894231.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/ripegikojabutidosokize.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98426961960.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/52961755634.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160beb4c41f156---41683260284.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/667b9b56a5b0c15dd8a88bb7461b8b56/74411236247.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_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 18568 bytes
SHA-256: 6747ef7055fc886b77a9f957d4f678e3dce0a76619c06a37aab5bcce5ed4c20b
font_01_sfnt_off00015b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17332 10688 bytes
SHA-256: 2d029d13f97bfcc0179f5fbadf575e50de5ea35c9458a09aa49b5cc622d957d6