Malicious PDF — malware analysis report

Static analysis result for SHA-256 7367cf9696edda8c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 19:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 09c1a54684fe5638809616341e68a0d6 SHA-1: 6b5c799f7b1239ad1f1f644d0c692f654426f2f3 SHA-256: 7367cf9696edda8cfa5e97b17f77b56ca46aa5c5766a4098672c0e76e0e962f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nadiadsa.org/userfiles/file/77508991395.pdf In PDF document text
    • https://kluchar.net/klucharnet/images/file/puwifalasekimukavomoladam.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/zugoreturofizelonuvow.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e217b5ae8---79932684532.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/36512494202.pdfIn PDF document text
    • https://spacio.hk/attachment/file/sevitexubemaguvezojif.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/81101001398.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614282b764986---ladimuparufagimupuzibu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/zuzikibadoxixupemakin.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/83207826115.pdfIn PDF document text
    • http://mestan.by/images/file/87900317865.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161425519d74e9---35368660479.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/dematepepe.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630586218/files/76013996328.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/dinolavawezofamutupidu.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/pibosudizipuf.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/31207938677.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c73749c0b---gugogafu.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/6248751075.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/vunigubisovivevin.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/66327447751.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302da4401c6---32733154953.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/gadikoj.pdfIn PDF document text
    • https://led7.ru/file/nifitanudifuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=emoji+in+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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 14380 bytes
SHA-256: e65c601a84c05c18e6490dc87457373bfe9fcedc962a5b70e653806f41b2cd4f
font_01_sfnt_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10076 bytes
SHA-256: 01935429746f408a06342496c1ea401ea473c07072d8a0632988aeced0cf2c8a

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