Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f906ff4d7ba432…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 15:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6eed2210a514f356dd51cf988dd61c1 SHA-1: 023e4927f4da63e7dc19991d79b09e95ee10ef02 SHA-256: 79f906ff4d7ba432e5d49635d4bff7358a4fd70418a5697d4c1ac705e6ff0526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS platforms. The presence of multiple PDF link farm rules suggests a deliberate attempt to distribute malicious content or phish users through a network of disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zotebomekozidugimute.pdf In PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8c5495da6f2d9df8efb8af57d747c21a/mifotipozunopagegug.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/97988200497.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109061551258425.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mudiremogevireveg.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/27093035558.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-9/20210909055556625052.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/nowepoduxisagejuxerij.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/kimigi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/babilixuj.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9df776a5---viwiponoj.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/92151357924.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/wikirogasidazububo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090610355877363.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/8859473469.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/41067619749.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/61563898249.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/7546464066.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/cvudftgn7timlrq8ns4t85t5h5/pewanoladetukejeku.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/wuwedalitinojumesi.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/tavilovigurosutibola.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/bogomibawu.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/89391323448.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/11584821823.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/riripupevojanuluribodot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=let+it+go+movie+2020PDF 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_off0000b57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 10136 bytes
SHA-256: d675454ce69a7a9cf19123124a76534bba8676f80416b0e199313b777f5e54d5
font_02_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 16752 bytes
SHA-256: 8f76ed274c6f519be4c7e9efb1504a3861ef380743ff9f3e87656eeb2df05392

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