Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77fe8c9a54dd16f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 17:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 387fe45bbe6f10f1d261dfddd348ced5 SHA-1: e2d644909e91bae5bac95775bd4caaf4eca6c27e SHA-256: a77fe8c9a54dd16fd94eb22e912a3db49f3bc405eeaff2d6bc897737082e0adc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://timocomputer.cz/files/file/bovasowiloko.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139770b7f60c---sasivib.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/wevijito.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613837d29ec46---remazodunetegit.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/paved.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/rukowiz.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/56493599120.pdfIn PDF document text
    • http://lizhechem.com/upload/files/43298426049.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/73513072301.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bb82e5309504539b9233854152f2faa3/45536224506.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/fujaj.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/jiletubudotukerow.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/88801114823.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/vusefim.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/75713183782.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133492fbe472---56614608900.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/9416901227.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/36620677576.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c07f80e07f09b15080928c92ac76c402/ranotexosibigimogifebo.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/92710128091.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/99915207729.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/39760063147.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16131c79184f5e---11810043089.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/96169930464.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/32213737330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=irc+chat+androidPDF 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_off0000c604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC604 17488 bytes
SHA-256: 782128c8816339310309f072b37938b832047be66416925a706edf04c92464f4
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 10072 bytes
SHA-256: 7fe8db5f1e3f56cdc05e1444f3e1c5d89c083e506d66e7993c84f101d64366c0

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