Malicious PDF — malware analysis report

Static analysis result for SHA-256 f462d67b69aaca9b…

MALICIOUS

PDF

96.9 KB Created: 2021-07-05 21:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ef67818eea25a9cc304f5f9bdf548ac SHA-1: a0f4161a293272882c67d3bf2c0d658ecfab3bcc SHA-256: f462d67b69aaca9b6097d5c06e91b2df804bbe723e555483aa97b1b25aa329f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=1+day+egg+fast
    • https://pathakpharma.in/singhania/downloads/file/peronurujigupugosolifo.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b6873cc8---62390039979.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8ba321cc---3020805712.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d57a9715ef3ffdc6de2cc1a152dc1704/fogikubevetabegewibogu.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f32353ed9---22257383989.pdf
    • http://malagi.pl/user-files/fck/file/1011289763.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b861675cd7e---31294871113.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609852ca7ad71---24086600245.pdf
    • https://calmoinc.com/upload/editor/file/15317496600.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/47b3388e5b05525a477ddd4009581444/kexakakunikawikepuvewof.pdf
    • http://thedewakohchang.com/image/upload/File/1778613162.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/f56dnqtnhkalef907ul1g17u59/80018508104.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fb652d420---70098735707.pdf
    • http://www.allatpatikapecs.hu/images/file/xokepobobuniweburor.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d37331bb---zenofajinek.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9efaafb1e20b114ce65c2c39c7d3bffc/78973087109.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d1d114219---nulixavolagoz.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddf270d53---rufematoxojebiletuxej.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/861ed8b8315e9c98c05bf4bbe222bac2/50761315208.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76f83d823c---27394850311.pdf
    • https://paklya.su/design/img/upload/file/48550436042.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/j6f07hph112930jua4ffev6ugl/dewowabapoxenan.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878dae98cd4---4036637890.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917fee4ec79---jozijen.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708aef79eb8---sesejukopolovul.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_off00011bcf.bin
0e483a3ee2e792288e1ead015feab1ed18e9d02dcaff08891a928d90a7ae4282
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 16948 bytes
font_01_sfnt_off000147c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147C7 16792 bytes
font_02_sfnt_off00015fde.bin
2a6cad0a656d71935872ad0194c086cd35a5eeb22c331bdd56d18c90da7d7612
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDE 10136 bytes