Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc29c08ecd341948…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 04:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 681257ea5045f0faa4376df2c211786a SHA-1: dd99da1a02c34a96deeb654f973e60382234f942 SHA-256: fc29c08ecd3419483b028e29844baf6aadc8316b2a0ffabaea123ade2060e07e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs, several of which are hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://conexkarvan.com/cache/fck_files/file/witejetekapupab.pdf In PDF document text
    • https://zzhqhi.com/d/files/nuwutafubodexiboxarika.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/topesopezasivemijavefoli.pdfIn PDF document text
    • http://matras-devison.com/upload/file/33779449566.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/3183188752.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/fovonuged.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/xenimefogujolamipaz.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/zarudog.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/78690260391.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/bosepakasaweboto.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/99a4c484b60ebe8d77c94731c252b7e1/wiritub.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/98293034833.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/65151484789.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/50530787790.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pve8vvl25gkumn93f7g2iujl05/58981134966.pdfIn PDF document text
    • http://keramann.ru/uploads/files/lutipadawisotajazojalok.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a6c7402f3---43909208405.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/zobidetirojo.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/15115690389.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/lufiwivowawube.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/51728818367.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/032334516243.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140ab333cfd8---51139824351.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136727a33a48---nozes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+app+icon+not+showing+on+some+devicesPDF 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_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 18764 bytes
SHA-256: cf08a94f9c6c96ebe83306666b1a2e810f93b5d8b8dc7c29bcd28ec6e46f48b4
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 11048 bytes
SHA-256: 389ca77e9b1bd6f7b6fc339a455c3911af705e66ca615cbb81ac103337a8d946

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