Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3958d34caff0deb…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 02:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f30bd0245869e8621d74a63458b46525 SHA-1: 2e27dbd61bfb56c0979d44cd42c721b0a17034ee SHA-256: c3958d34caff0debc5874e92f712f7dd1f647bcec54b17514da01388418f1be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/eq9o03gvbqbbrlubbnud98qdb0/73756275277.pdf
    • http://hoaisonland.vn/upload/files/fejizuw.pdf
    • http://jkbprivateiti.com/userfiles/file/fakobuvarikowobewo.pdf
    • http://jandenzobv.com/image_uploads/file/54213700980.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d58d55b432fe525b887b22d605fcbe5f/78036406455.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954bbbc7d64---kanozudidu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c6e759cc---lideboferitojote.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/22862809922.pdf
    • http://rolmech-strzelno.pl/Upload/file/linipo.pdf
    • https://burstallconrad.com/editor_files/file/pomuvikabevaxemok.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/pimadovodopuriratevabikap.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/be2538a4957e172e171811d6b9a7577f/53846246264.pdf
    • http://turagent007.ru/userfiles/file/valesez.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5bd0439c---68620446882.pdf
    • http://alexlunacoach.com/img/editor/file/zowizawidakove.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/92fhtucj8kmh7rkvr5tfjvr8e5/fodegedas.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4e194d23---97652787206.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85f7564f7a---14811505534.pdf
    • https://caribemed.com/userfiles/file/16429465250.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/37154709706.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5c32765f6---42161121820.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/lepijiki.pdf
    • https://actor-conseil.com/files/file/46373411705.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/m6pjdj9cf5so7lrk52grla7udr/sodagokobobufot.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9d637977---44422530874.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+retrieve+deleted+messages+on+messenger+using+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 16792 bytes
font_01_sfnt_off00010b95.bin
84d6d68e68347d7afb1a1476bb494c0637742f9a7585789c42e4163e29505920
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 11084 bytes
font_02_sfnt_off000124fd.bin
886c144ab2ce92c0eb683753f31a3b70d72e849f7a654aa6200e45b2a4542371
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 17388 bytes