Malicious PDF — malware analysis report

Static analysis result for SHA-256 943037654d423e0e…

MALICIOUS

PDF

102.7 KB Created: 2021-08-07 07:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98b6572ee43643e8896d78e094826a4f SHA-1: 681c20d6b4e45025681af44d6fc2873dcbcbaaca SHA-256: 943037654d423e0e9e6a9d7686971ba7fd0b836e4b0c68cc85342344dc7f2b04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4feb1438e---jogakuk.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104f0d026f88---36492773414.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/18133904309.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f6e4b381ba3f24ef0e6e1c3191d048aa/wogijufetofelofu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ug47r8pkg9kkech2fc1gv44maj/jakutaju.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/88912371824.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c4a61ad3---kimaz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39de1f810---51154996358.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/86791035193.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ace29692c7ca4bf1ada5f03437e28e6d/46781248713.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9c225f1eec0a6b5223d0e318d15480e2/45279221041.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6634a092f---40222474148.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43e196d6f---19238259737.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ee9360cf74ac54f1bb3c9daedd824c09/69645629470.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4165784fef---ramupajuvarodomulazi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/635d40e0733cd7eb2cbda7b5bccfc0a1/fuvikezug.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9b8aa9014---nimozo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/gezibesa.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/ruxen.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/kejifekosok.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/45f9008b68f5128fbab17e794034832b/wesedagolewufune.pdfIn PDF document text
    • http://mousike.it/img_ins/files/patedegola.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc7f259851---melevawinukutupaj.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/9995744902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=invisible+man+ralph+ellison+analysisPDF 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_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14761 10688 bytes
SHA-256: b399bdfbc423057952ecb81612b11da3c681b01a90bd11786d4257aff8e95df7
font_02_sfnt_off00015f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6D 17516 bytes
SHA-256: f92626210708e7329d6e7b83d1b9ef0ba63507cac1e7a40b06c931b884186a82