Malicious PDF — malware analysis report

Static analysis result for SHA-256 631431ea4fc91d23…

MALICIOUS

PDF

188.7 KB Created: 2021-09-08 08:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b072f05ea9dd6279171cac419c3b363 SHA-1: b18693b02bf636d7afb3c801fc0968b38d6451e1 SHA-256: 631431ea4fc91d23e0bfb457f1b8e889eae2710c2f7e6663a952ce62c88e1947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://oniceh.ru/uplcv?utm_term=filosofando+em+pdf PDF link annotation
    • https://amd-export.com/site/upload/file/lezijadasusugetoge.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/15255784611.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160732e020516a---59080792640.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/22979203022.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/sepunefifade.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8e736c3d1---kixelovezi.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/dilavikofunukazakoxex.pdfIn PDF document text
    • http://4bx.pl/public/file/54534434398.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9ec175d7---45494800086.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/kizikodusam.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0069c55ba9183711630dcbe5e70347b9/xamakid.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a26cf2a4ddb12427419da44d7d9ba9d2/28201752251.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a32dff9c0cc---1486790846.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/16286434655.pdfIn PDF document text
    • http://pinxedien.net/upload/files/78261480699.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/sodadupuwakapo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/838dcbcc5281584631728467c278d28e/40481587696.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72ed608e1---71397625923.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76525116025.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606ffce59de3f---nijusowiw.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/46987766101.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/74513448648.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/39375060115.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a37e6aa87---jitomiregudilave.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f365a662921---gixinopuzekibevewijedu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/37759567748.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_off00027ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27AC6 22432 bytes
SHA-256: d58cb79d469f87396b097d1d3ec3c1928ae27745669140b92f1b4b5b212329e7
font_01_sfnt_off0002b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC8C 10440 bytes
SHA-256: 42a6e3c3bc2994047752e80305a55506e62fa34dab01ae719e8c114915c86642

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