Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d56afa3d89b4166…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 14:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2e21e441f300a0c2b1e85646a14014c0 SHA-1: 4fc1c26ab300c488ba5c27b68abe4a46afc29d31 SHA-256: 9d56afa3d89b41668f4915f154c26b91f9186dd6845ffd472614ae13f5361c81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, many with UTM parameters, suggests an attempt to distribute phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=ff+apk+latest PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384bdd7c8c7---53949024456.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/fuxubikenoxowegabazitu.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/24165066042.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/zuxeneb.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/rubarekujetudaful.pdfIn PDF document text
    • https://ms01bet.net/contents/files/31326255053.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161567d8b08800---tefirumumipusi.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/83780189165.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/rixakepesorolav.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/fenozoxi.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/40902307769.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/jomumirez.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/tibijebivonopibivi.pdfIn PDF document text
    • https://wasael.com/userfiles/file/28182007643.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/84087715199.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1072d8e1e---10929843482.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xeridobokafavurug.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/60160951728.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/voside.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/pitosaroralurusexoxixaf.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/jujujukanuxopaju.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/wejivonavizufugifov.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_off0000b07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07C 10004 bytes
SHA-256: 85ef52da3c7ebfb41e2f4328e9f6003d51e18688efbb99cf597b4ccd64c3265f
font_01_sfnt_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 15200 bytes
SHA-256: b2aedf0d8fd36955d66156e8304ef78a7a5b2982dc42efa1174508c2388b5d65
font_02_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1