Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3742badee298f5e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 22:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a6af02399652afe28e9bb6e280750c51 SHA-1: 8633cfaa433fea1d3dee7b2fbe444e20cb8e6095 SHA-256: b3742badee298f5e56cfb3ea966ea53c3a51a9202a3af36bf5663f7cefbeba88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=diploma+maths+book+pdf PDF link annotation
    • http://belniig.by/public/file/62607025768.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sackc3rkibd8algo86rbn1be8h/74369491850.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wapoli.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/67218737475.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/rimojofipezolobopo.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/3650146949.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/93991017189.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/kiraxagarir.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/bakafumebegima.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/75457304480.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/tolezotifamarizutenezide.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/pitixaxarosokoguxez.pdfIn PDF document text
    • http://web5gstore.com/Files/files/14033795935.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/82034641723.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/wugijimuxafimoku.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0495q14dlqm4mgaki5bd6edoh1/sizeji.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/52527444924.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dekunukanaretafevefi.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/53965692996.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe7805ef7---figipulume.pdfIn PDF document text
    • http://siangyun.com/upfiles/editor/files/93654474510.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/46140881555.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/vofapexotekovexosaxafurid.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/wudoxezebexej.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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 10660 bytes
SHA-256: 9fc87b7b475fd8434d3abe16a47ed92547dfa4e87d5d28774b04f6e6cc1c36ff
font_01_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 16468 bytes
SHA-256: bfc56a438fa0cc33601c07fbcb1ae8af0b50347b9348648a6d001dfb22dd6d2f