Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3e58cfbf05e3c7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 08:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fab0384588b9ee20759c3560ed221c02 SHA-1: 6826a4b7173faa07fe96d18f58dbee44c32c212f SHA-256: 6f3e58cfbf05e3c7ca28c32878412323559e9a460e2f10eb43363b9f8fc419a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecfed7a1af---ravamiro.pdf In PDF document text
    • http://moretonassets.net/userfiles/dagafafik.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/fatobedanu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a765e11f---kunufuzotodokowezovejof.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sulix.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40d6ed9ce---raseli.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b60d1ba5afae46015f4041ab1608a83b/66509972460.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/19557cf3d792250eabc01ccf9e911529/tosuwipuruwasewukosigu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/22178eaebe3bbbdba442dc6b439085d4/54406429545.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/luvuvegajapemusapapusekik.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b098cf8b---35975773808.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/roxekizofojetegiwiwi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7dd6d863a---mexijo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080115e678c2---lalejujilurusokoduse.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/94497519948.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4dc53d87---pipulovejuzob.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/44676708963.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/98370481394.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/tuxawodimaretev.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/56004130459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ereading+point+of+view+worksheet+1PDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/47409043310.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_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 16620 bytes
SHA-256: b105c348fcac531a105aad2bef763919c0afa349d1b9e4e8cf89b73d2d3b455a
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 11012 bytes
SHA-256: 52d74fe5872050d769911b716a8206f7c694c9543eea807ae20e56cd2012ca8e
font_02_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1