Malicious PDF — malware analysis report

Static analysis result for SHA-256 e169d0de965f7fd0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 00:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cca9bbacbf9e7f95bc80e4e34f4f10f0 SHA-1: 67340814ae01dd6018887996be59f54cdb810910 SHA-256: e169d0de965f7fd06841a0dbb747ec6e64bdbae548da5ac6a9ced389d6a2b353
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/84454253309.pdf In PDF document text
    • http://homeloanz.net/images/e/file/66501147598.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/23648048000.pdfIn PDF document text
    • https://educhina.mn/editor/files/50114301722.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/fikuroxogakumojedatu.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/fopobonoxutolorola.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/tusipub.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161422278d6620---10291836770.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/famibune.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd3985b9d---ganete.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/61089091076.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/mubomorumebin.pdfIn PDF document text
    • http://vucert.vn/uploads/files/zivilek.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/xitavuwenigovojo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141025ccb8b2---91506692000.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/9579182146.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/nofenoxowabikekipakenulu.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/61548156165.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/jafagole.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/98874556138.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/37685743614.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c732a04e---53052136622.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/91011985460.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/33906748570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+the+l+word+season+3+online+freePDF 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_off0000d39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 17544 bytes
SHA-256: 942033fa2f6cf13ab358cc7811f2eef8b22c530cd52efdbd14c345efd8a3fc52
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10824 bytes
SHA-256: 9b6b45597212f2d871578c43bbf4869dde9be4d7f1e7128d1eb8e8af719efa4e
font_02_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1