Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a7e9ceabe9ed2b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 20:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5f79402d8e3a731f540a6064d2e837b0 SHA-1: 17551bd2e3eb77a97a95156541cd340f3ced741d SHA-256: 92a7e9ceabe9ed2b839fa3cd65d498a9fb8413bf65ed8bbe50037d4bdef9cc4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://tourister.kr/userfiles/file/59379729404.pdf In PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/fibinonuj.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/17448684461.pdfIn PDF document text
    • http://weingut-suppan.at/files/dovisesomulogomapi.pdfIn PDF document text
    • https://motacademy.it/file/goxepaw.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/kelixemejinumofewuxekadu.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/47081152863.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160948de24fd71---diwalebekitepujukexexev.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/82144541290.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a63fdfc7b---babuto.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/32e278cd53c3509efa6776e475700ad4/98771887391.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f93a8e37a---13202666965.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a09355a7da1---39767101363.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/733f94e99fd4736242a09f3dfc713893/44469152840.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/91413142150.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0164113e8---29347009838.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21f5d57ea---sibotukedubilogewex.pdfIn PDF document text
    • https://kapefashion.com/files/files/xumubugobivasofizo.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/xobuzugen.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/21966601406.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/39f89b567cbcf5252abcb1f0dab6e38b/musif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=christopher+isherwood+a+single+man+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_off0000b564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB564 11060 bytes
SHA-256: b4489e23cd99f55337a8594148b23f7cbaf6854789557b7a8a1b8594d2440cf6
font_01_sfnt_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 17224 bytes
SHA-256: 8d34a9082a9dd016a7007afdf9b677fa453131a46a1c795211534198571fa9ca
font_02_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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