Malicious PDF — malware analysis report

Static analysis result for SHA-256 0512de4279d107c0…

MALICIOUS

PDF

92.1 KB Created: 2021-07-02 16:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e984728ded17608d5be54f096d55c3f2 SHA-1: c40c1deeff8ab1b8e830bc3c7aeb3c62eb8526b0 SHA-256: 0512de4279d107c0a8a0bf915d5632cd5dffb70b8e4426d5080ed5b1f8a128f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised WordPress sites, suggesting a link farm designed to distribute further malware or conduct phishing. No scripts were extracted, but the presence of multiple external links points towards a downloader or redirector pattern.

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 https://infrive.ru/uplcv?utm_term=the+parrots+of+telegraph+hill PDF link annotation
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/017bc9f87de96ba48c97854cdc15e4e5/lulonesepejikigugi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb44d00b---31291391688.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1992dc276bfd7f2fff1c876fb5921e31/kumani.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/laliropapopusubok.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/9491666085.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/78347675257.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fce6fac1---xopokowijiko.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/54417921879.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0dd4378c0---67791974166.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bcb9c6721---93571236617.pdfIn PDF document text
    • http://recrute.fr/files/files/mejadakepaxegivagabe.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b44de3622134992aff8633acc51c492f/16996162353.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/18ed249fc93fc8ab7ffcda46455d8b0c/sadisepanulemunik.pdfIn PDF document text
    • http://jarosi.hu/files/file/81296160748.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfb3fa0312---fumima.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd969f18fd4---32107663965.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h78vpm2i0s21u22mvdnocheb47/sibumevisugifirixurux.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/32128336836.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/52688777748.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/epd90cl824pql6h4g3lagtdlm9/lejikegupad.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/zebetakupuzezivukek.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e8843407---20415038251.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orujoxitirawuxog.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_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 10496 bytes
SHA-256: 81e8bd9f01cafd4f2295414c6a25150480864acc473ae78df0c967f4c6d29b15
font_02_sfnt_off0001349a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 17676 bytes
SHA-256: dd6c2575eecd6dafef3c59b65493f3473453ae4901c7364e817c5d650b808db8

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