Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a6bd5c20aacbb5…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 00:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 884cb881f1ea63c5e56e7765d42931df SHA-1: d3c90f8550b0b9a6aad2e6f05366493fe4c36fbe SHA-256: 03a6bd5c20aacbb55e33e78f97c564fc376ef02f3bb023aac18fa88a53f3c1aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=when+should+i+watch+the+naruto+movies
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6b8c68d9d927aea5fb2cba0036c5e8fa/46333955877.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46e09262f---28637275654.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/6vm03ha8ls1raig9lhd51vu6vd/85551408563.pdf
    • https://kaktutzhit.by/uploads/files/kegimowusagejipi.pdf
    • https://badrivishal.com/media/47211093025.pdf
    • http://skrabl.pl/www/rpbd/fck/file/fomisapetoz.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/jenome.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3ae089b55af24a990d8e70a1c2fd7df5/61120031933.pdf
    • https://fultoys.com/userfiles/56019539575.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/5621827601.pdf
    • http://alkanboya.com/files/file///57459631685.pdf
    • http://mobilesamara.com/img/files/file/57759174197.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1bfbec6ca97041fb1e65946ee050417b/zinorefekerumirim.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2ce92e5b6dte5jb3uunu2b61q2/vigugizivodep.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5e9cc8850d285514448f9f392592cc5b/73003000669.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/uaa66k3rs4jfvhvlnsabb9m23o/59928998401.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091c15f0ccfc---62866601425.pdf
    • http://bbfederico2.net/userfiles/file/pibozuzopiv.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ad2ce2ed5dc9d1505e1437c38f007c91/vusujetonijopikete.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a5bfc366de8a8dd829fb7ed278d5b993/fujopitagugimemimofonan.pdf
    • http://cobansut.com/userfiles/file/fofezelijadezaja.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vlmdsupkqvigm4t873i69ob5c0/bunizasutugimuli.pdf
    • https://alixdemassy.fr/userfiles/file/nituginasora.pdf
    • 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_off0000f2d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16792 bytes
font_01_sfnt_off00010ae9.bin
cc9a807fa66f87801b284003cbc444d026b97852d9d3a54aa38d97f03db63534
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 10880 bytes
font_02_sfnt_off000123ee.bin
92574ca41694ead59741b2cebcd2d49b28a2284f8f4f9f9939c18af162fa69cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 17376 bytes