Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bc11230fd03b56…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 02:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3db8936b1da172c62885edabd054ec75 SHA-1: ee1bc5dd80036eb4789cdb15048b06d970e6ff27 SHA-256: b6bc11230fd03b5616a3391a7913c241e1b412fdacf0d6330e00aae98ba7a67d
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://masonhn.com/d/files/zifopitusawijidinul.pdf In PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/88289611840.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dobakikenoletutuseki.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/zuremibiw.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0913d431079a4c4bcb4fea89d5836de3/32889002597.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134530b97a5a---30945815408.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfd64bd0b---61222049009.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/80647480422.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/vuritudadoxef.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/67313376275.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/doguxa.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/36900816908.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/sigomololuvop.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/besiwiredujenorivoroxaje.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/91892525011.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/31301845455.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/75906361365.pdfIn PDF document text
    • http://prmakeup.com/Image/files/36187520277.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/pakumudazudefuzipagimutop.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/92042429219.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/memusogusep.pdfIn PDF document text
    • http://intersonik.eu/upload/files/jugokutejodivag.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/84195694802.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/58589062361.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/46654049158.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/fabit.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132769f8c67e---58244551149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=negative+words+beginning+with+sPDF 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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 10748 bytes
SHA-256: b6b27f52c36eb6e8ebc0b3b62e68cc5d7ec280366ac955e768b8876f82c3b629
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 16784 bytes
SHA-256: 3747a4e980de0f6563c819e45d78fa528b451deb342d5088e4823904ce34acc3
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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