Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecdbb2b7983bc84…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 13:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39f312008565c94dbed87b5795ebe0ec SHA-1: 82c999815fdd0fc5f6b7c55c65924d528ca03849 SHA-256: 8ecdbb2b7983bc8415135155550d527c8010d572d8cadd9f32a0ae368ee7bba5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the classification as a 'Phishing.Trojan' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kondicionery-vidnoe.ru/upload_picture/file/3529068256.pdf In PDF document text
    • https://hsse.cl/files/28331586428.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/jekidazugosul.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3684403a13c3f55ee0336581e1eaf849/50701053351.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/gomotigatip.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed235e30e5---36496993337.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/86233281493.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6474f21391---giselamagufopilevifu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/640d676ef40221612b5535796d483237/56939403161.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ec8c7f68d9ac1cacdd661596d2a8111c/wurebuk.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wosegijetomexenuxeluva.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/30625183943.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/97199500354.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/28434327939.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f7de369b---46400547167.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/998t61nrrml7to5vhsvtomfnc4/84791011125.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/62212003966.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/37464708002.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/45400970386.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1225da864252f38f7868b63b23b5a99e/47275093748.pdfIn PDF document text
    • http://sooclose.eu/upload/File/gibitukasawamebur.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084815fbc996---6180633455.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/27493876989.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16288752944007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mcse+study+guide+2016+pdfPDF 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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 17720 bytes
SHA-256: adb3c2845ec5e5f77fdab4dd55a39696840d58163e5514886dacd641df1f0a39
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 10932 bytes
SHA-256: c17f1fcf7950b08beb8f61c277f86296ffcc553a950b9b681d284bf3e8686f3a

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