Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb07a8eb3828e099…

MALICIOUS

PDF

96.1 KB Created: 2021-09-18 13:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e96f467557f805452d7538135a84e4f SHA-1: 0d460c1d342e9b7530646cd57760271d6446e483 SHA-256: fb07a8eb3828e099420622d5a0a1663d85b9017f24b835f807df185863a946e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://allytemp.ru/uplcv?utm_term=android+games+coming+soon PDF link annotation
    • http://afslab.asia/upload/files/77246837020.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210918_71345F094210E3E6.pdfIn PDF document text
    • http://potya.com/lilejuwonezof.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a8723ecc3---40667872992.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/ponodadefizidatadimek.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/lidigarimijup.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/jajagixiruwivaxeni.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/17134425335.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614481810150e---rodejevafe.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/14688972504.pdfIn PDF document text
    • https://esz.jp/img/editor/files/zasivivojakafevor.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/53796490720.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uh22h8f0bia16m9rreqrt56rp5/85928341286.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109060714147176.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133290427ecd---66004873327.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fuwanojoziwavofeda.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/24135638993.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/mamawovujetiditelijo.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/78759642662.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/85261381262.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/99226922599.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/34659759037.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/vizujosixesurobudetub.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0a3a2f1a93c171cf75e28a24c2f21471/98289747498.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kuxamoli.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/jamewezuridikupa.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_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 10552 bytes
SHA-256: 06b232b93ca2edc611950eef28db54758f34fc9d3f6b6f1ac14864b6d646e46e
font_02_sfnt_off00014200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14200 18636 bytes
SHA-256: 0721ef3c20d47264d438b7718bc4beced42a7f63cb4a7c168e268ed77c7e1f80

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