Malicious PDF — malware analysis report

Static analysis result for SHA-256 2118f802f735697e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 21:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 66f6f8ce68758dd8b5a090b7fb984c8f SHA-1: 7f96c8703343b0fb90beaf1cdb1d7c4531b35eea SHA-256: 2118f802f735697e733bb41ce59489cd6ce24df30c3a96a17e9fb10ff88a7d3e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=persona+4+social+link+rise PDF link annotation
    • http://toshiteriyakiburien.com/uploads/files/85000649347.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/pegiwagesukixa.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/77909103683.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140118bedf3d---luwosaranifefaza.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/feruzuvuvorajixewapij.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/99161686045.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ad7f4dfaecfb93f698ca1f0e42ec2b8f/xebasovizuzakujefeke.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/posedef.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34446321381.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374929b199f---57835833745.pdfIn PDF document text
    • http://www.ezmoving.com/file/9471835685.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/monukiguzesesopiwurivemi.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1053294920613f9e3d583a3.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/74036604663.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/tunusofutexunowekivopid.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109021804502591.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/lejizakaku.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/tefetavirogiwejuk.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vilujuwuvafosukile.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/texutorafewarejudofogu.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/73745282695.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a90b33abb53fd8d02105e40e9762530c/borodixepozidekiniz.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/belavasobukesafusa.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 19896 bytes
SHA-256: 5250a35c3d53a14511b78367c64a6c92225b60b282d90c2f5df965f1d03030f6
font_02_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 10296 bytes
SHA-256: b3acca1b7b40351f5312342098cd85c1acc7b30db14e1544ca187a604aee8b19

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