Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57d43bee2cdecd8…

MALICIOUS

PDF

89.2 KB Created: 2021-07-02 02:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aac5dad0c83f139d6c3a6d5ccab51534 SHA-1: 8015f2cd7af05eb7731d23e8a99aa4931338d592 SHA-256: f57d43bee2cdecd8bca019b608e16c23ec89c3272f8b337e3ebd6ca7b5ca0aed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be directing users to potentially harmful external resources, likely as part of a phishing or malware delivery scheme.

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 http://associatedreclaimed.com/userfiles/files/65606333002.pdf In PDF document text
    • http://m2m2design.com/userfiles/88925629330.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bb98b2f260b---tavatekukezaxinunoloku.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4780067a16abe7c84e461e61feb03b2b/mexot.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071782025f95---43416272984.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/iuck9cp009smioiq218irg53r6/lunuxegerozisawilikilu.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/264466073.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/51859842986.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3fe0b01f1---26867755622.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff053f5b0---77631673739.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/06a44b2b8d6dd26ff128232b0b9e655f/17900159913.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d06e1fea21b4b3febf79932c1075f220/vibiwemevoxegudikewe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2650b0beb7ecf2dcf2416d0dbde348ca/xosifevaralemulexiruv.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04280ec3759b0ce5b9ae229d71abeb96/tavamudonutigerib.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/jeratemafirib.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/90937938381.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/13f2f2d517a2497001588666fbd08ea6/rekugunudubedizuxe.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/kigelo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcae2c8928---52830178306.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/fupavoleralemuj.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/25156471609.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/wuweketibavezidomi.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/patekekubojiterasamigo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d7db60421be16ab883b60165184f9fd3/20875171729.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4d2e125c---kilonaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=flash+player+not+working+windows+10+chromePDF 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_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 11404 bytes
SHA-256: 17d089485b65a752eefe006c549b5841b2006ee93d324d5cac4cc7ba8da38abe
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 17584 bytes
SHA-256: 76ca83029d8ab3fe990318a2cc97fee2a960f28dc8f21851ff758455f2a7b6b0
font_02_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1