Malicious PDF — malware analysis report

Static analysis result for SHA-256 9744d0ba962fc6ef…

MALICIOUS

PDF

95.0 KB Created: 2021-07-01 20:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 89f4950cad7109e884b66810316ea77f SHA-1: fc41aff756edd0b6d3f388a42587c70f839fea46 SHA-256: 9744d0ba962fc6ef13a2db055a72e5adbe5c7ad789283d2ff8b8e831cd92b8e5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The presence of these links indicates a likely phishing or malware distribution vector, potentially leveraging a spearphishing attachment initial access method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=taylor+management+theory+pdf PDF link annotation
    • http://papinchess.ru/userfiles/file/48070615553.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab1b83cdec---sajevikagejevutejut.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe34d50f58---goluweradizerilisa.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7b88d946---sugitazuk.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ee3f19b5---8877734409.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ed3415380dce762250317a7d321f4204/dogitaf.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f859522413d1d63619d4d089edb34b0a/nelibademeli.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/palepa.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/51288811298.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160700b5e4468f---21984328628.pdfIn PDF document text
    • https://mfdesign.hu/files/file/tafozinifisoxelekajom.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73f6bd1ad9---kupudoduwit.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v1oq9uq8p233ftbk4if3s88567/rajogemijafavumuw.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/10873177705.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-25/20210525040513544141.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e1181387---7204059890.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/raxowapofuxubetorug.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/wewikom.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1onsbqr63an2d0jvkjui3u7b62/wawadisukiburozo.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/vilamafo.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/85055113496.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b841b35185---66381516968.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_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 17916 bytes
SHA-256: cd7ebd774acf4ebca318e6cc57f5d2f866fbb3b8d1df569be96736275adff70e
font_01_sfnt_off00013e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E46 10760 bytes
SHA-256: ff2590a387637570c1719c8571f3b84e69d6915f5f14ac339c9973790bfec9aa
font_02_sfnt_off000156ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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