Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cbf4306e6cb70f…

MALICIOUS

PDF

85.8 KB Created: 2021-08-25 10:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c431bf2e7053073179806c6ae9f1301 SHA-1: 05c33739dd3a573b7f26b4fb15513c2c49619a8b SHA-256: 00cbf4306e6cb70f2f008b4e2e99ec3faca9f0e5b2b6210021e3abb7e9aacafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further payload delivery. The document body is unreadable, but the heuristic firings clearly describe a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://dewalt-naradi.cz/media/upload/editor/file/1288102764.pdf In PDF document text
    • http://unicorn-furnitures.com/d/files/toxuzalu.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/sororupejavagurev.pdfIn PDF document text
    • https://strechybenesov.cz/content/xedanagodajefati.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kizupefaguzejarizunigo.pdfIn PDF document text
    • https://dananeye.com/uploads//files/202108081517357737.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/xemiselamamodubesinivubot1627049007.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161151a93ef66b---72156532756.pdfIn PDF document text
    • http://emannsltd.com/userfiles/sawewifixef.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/luvinogerizob.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/29/1704206524.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ja4sedn9e0b6omsvbiutsgf7il/gegixikinar.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d7013d20bfa501b4b5818b9adf71fc0e/85606733590.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zuzuwowalegobaxazaf.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bc013ed35---94649348882.pdfIn PDF document text
    • http://cy2hand.com/userfiles/dexazupomabinufisimevemem.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/45427888183.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b30268069f---dufazowazotenel.pdfIn PDF document text
    • http://splogservice.ru/content/file/34428863787.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/bonefokibukoloxulosise.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/36374914618.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160814308d85d3---69469511608.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/zuruwezigafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=occupant+in+a+sentencePDF 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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 10228 bytes
SHA-256: 736d14f068d24faab7f5db270059028253f895090f0ae9f86cbec7d6a75274a3
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 17240 bytes
SHA-256: c77820ddff0a05582e61b1c092bbf449be85612a8b03717dd29c06f4a6f34f3c

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