Malicious PDF — malware analysis report

Static analysis result for SHA-256 8652d5609dd676ff…

MALICIOUS

PDF

82.7 KB Created: 2021-08-15 19:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79388d776a9c2a9d3f7b9b44e04a9c92 SHA-1: 4616615100ec37c57772e54b2a6350c55b5902b6 SHA-256: 8652d5609dd676ff9af2fea779106e90463b7976531bb2ff5cf2eb16e7f8c95b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://computergramm.com/userfiles/file/gotonitenuzade.pdf In PDF document text
    • http://remaining-mc.de/userfiles/file/35875796852.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/9u9ua5l8f6j32p9nfp9o0otbth/kutiluzebis.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/sativipibajizamad.pdfIn PDF document text
    • http://leguido.net/files/lugunom.pdfIn PDF document text
    • http://abc-tel.ru/data/File/54027533676.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0160ee4f55---zesuvitelikefagigo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zutojuduto.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/17479720960.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/67348993207.pdfIn PDF document text
    • http://alkanboya.com/files/file///fewojanerep.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/57500561015.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da6e4f343---pizojubabowojefosadi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2b1d00c52bbddab6c43ab4658228663a/setelapezuxitazobet.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32a474be70---tuwupugolitemew.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec05e298f5---34112300472.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c94c1459c---57317496982.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/89661687011.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/00031ccbba6862bcf89b9271b027a8da/5928634446.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/modapu.pdfIn PDF document text
    • http://limoride.net/gallery/file/jotabewomenojimilin.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a59330ffc8cad0202269fa970cec8a1d/90486141770.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/10150594338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=administracion+de+recursos+humanos+bohlander+snell+sherman+pdf+17+edicionPDF 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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 11208 bytes
SHA-256: 41c4dead8de8d44904e87a19d751fefa2c10326604392818c53d539ca32ddd5b
font_01_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 18096 bytes
SHA-256: 7bc68044c5c49219e3638202c223e44f59238b86472462a14b80128872d8df1a
font_02_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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