Malicious PDF — malware analysis report

Static analysis result for SHA-256 067e87211fd05075…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 05:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55415fd00e79b5474d24392ee9221acd SHA-1: d6cd433a963a44575ebce9fd750f242d42ca36bc SHA-256: 067e87211fd050751fb6741f3fdc28e9465c0dd1e9a81e4392dd2538732a438b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to PDF files hosted on compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://anakmeong.com/contents//files/99036554996.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/la7vb3lbmqleeempom9fgdhrj0/38085775575.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/vodik.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/16579485952.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/2314525925.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a8f1405c8---wiminakabevo.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/semusubafapiramev.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/babamedixovijikesepom.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/kukudijinajuse.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dead25b819f256e9b6278b9491be5c76/17525841610.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8a81bc33126c69de4f1d87b1926b58d7/fafuged.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/59286105429.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/97097597790.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/20514661036.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/xalaluwuvefu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebff2a9738---lopisirubuvupubopoti.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/65901581857.pdfIn PDF document text
    • https://bachson.net/upload/file/suvawujiwu.pdfIn PDF document text
    • https://chpcentre.com/files/file/tefub.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/26514858121.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/18374174749.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/vasifunupose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sustainability+accounting+and+reporting+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_off0000c3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A4 11224 bytes
SHA-256: 571d884a64d647479e8742f5110a4585438ecdbae64552779ea8e1a0de4cb90c
font_01_sfnt_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 17660 bytes
SHA-256: 1d2463e9cc4f6a0413511c57f452998fb356f033247d969404d1d17874f8f2cd
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1