Malicious PDF — malware analysis report

Static analysis result for SHA-256 930f3a32d95520b1…

MALICIOUS

PDF

75.7 KB Created: 2021-07-23 23:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc41610d0f9646525050c10a27456125 SHA-1: 47dd770933b69c495181369bf91a6a54436c25ee SHA-256: 930f3a32d95520b1ff3f251b4844b8d6a6c14be96bb52fe33461a933ec922d47
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of external URIs and the nature of the links strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smartpaintingplus.com/userfiles/files/gevuruxarevefuf.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7ac19b5684acd87480b282a6ed248b55/getalesajizutuzeni.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b2c42800f---15356325175.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ae44ce9a824e32c3530a416e6f85abb1/wodipebuzabupigonevuku.pdfIn PDF document text
    • http://asfalon.com/__files/file/82704144850.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/bapeve.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///68221014223.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46d173e33---33336227263.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/88365634584.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e8328cf0f56002c00d4bef5c308de7b1/88218864212.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/2279109384.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0d8b2a6be9a14e87f036c4678e8ecee8/76957241688.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/75418183482.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ttmqm65nbba2ut44fosg1teoja/57883700774.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/89843931907.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/fudorezutilinesefiji.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8q4s1mrpt4qmdnai4egq36hli7/goturago.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10d96b421---muluduse.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e4b5c145---tosoja.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607460895a140---gamidozekekufat.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/45510516123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rosario+de+liberacion+completo+padre+moises+larragaPDF 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_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16748 bytes
SHA-256: 7b1324abf82d25eebb47bc6980865d1b1a193b74ab07938d10a2bc33d37ffe5f
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 11044 bytes
SHA-256: ead710e1b34bf96e61d1fdd704e3a60c3037e8e3150c027c68c9ac7598795004

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