Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f836d3b1089a070…

MALICIOUS

PDF

94.6 KB Created: 2021-06-26 21:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b03e78b1ed9215bd9fe0176b574296b SHA-1: defcd758258238477d0db7320d5cb6f80ce93bd3 SHA-256: 8f836d3b1089a070839d2963f1cff5cbdb6e14b959166f860435450c4ed612a6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The PDF structure itself is minimal, with the primary function being to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6a83aaab5b44cb236e53ddedc1ac72de/14549357020.pdf In PDF document text
    • http://chataphan.com/file_media/file_image/file/fajuvew.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9653ba54---xetad.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/16117805123.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210609044845111.pdfIn PDF document text
    • https://unosms.us/userfiles/file/40418964785.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0363f0a5ecd8d660c2a3b668443107d3/febidegajadifaw.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727ab781ae2---xilodetujepu.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/16080546743.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pl7ra32gac5umr1a3999fpmi7v/nufeladimed.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b071b314---xovuwijamufamilefagafini.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/44372177443.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/77507327640.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763ec539bda---74461175133.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/73768405971.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/tagezemev.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/eq9o03gvbqbbrlubbnud98qdb0/73756275277.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/catdip3od7oasnogk70su0rnh5/bazezazofilani.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/88c3495b3f069804217bdc2628a8638c/78969844546.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/b8f7hhlb2krs81tqvthr8725cp/pemoxafijodixezakuwu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/77cc9465bb41927855be1263a1643b57/27750493161.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/84165717784.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1be7f3d8c9149cbb80e3103e682c39b0/jojomoxurolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=coning+abs+not+pregnantPDF 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_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 17632 bytes
SHA-256: 009a10d4c7f3558618fa66fdd6a28ffcff2619bfe8abba72a317124a36501394
font_01_sfnt_off00013baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAF 10552 bytes
SHA-256: 8c770c04652838b5502be3cb79abf5958c451bf32dbd77618c8873abc22c7f89
font_02_sfnt_off000153bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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