Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f7a137ac86809b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 11:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2870532cbbc62017c06143681546804 SHA-1: 750a208388e7b8b7b40f468c2d2500b5249ea75d SHA-256: 91f7a137ac86809b9b548a431073da068162f8f4f298745568b8956a2285382b
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable domains, suggesting an attempt to trick users into downloading malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=igi+project+apk PDF link annotation
    • http://monkey-do.net/userfiles/file/35489901586.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143c22d37feb---topugiwegumab.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/68195492589.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a060ae45753f314daedf8113abffcd40/bilelo.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/59200408516.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/revidejipelo.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/tawinoto.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/81510532123.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/20781689544.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/xuvonowafefikaxekulik.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/01748fbd1d3533b7b7982c2093db7d9c/xipud.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/51000722911.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/72698931421.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/90905210917.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161310211348f1---luzodepugikisufolenuniwa.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/54824717272.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/movim.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/34217564825.pdfIn PDF document text
    • https://krossi.ru/images/content/files/lubapupafexadefimakis.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/34959454493.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/63381051377.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6fa3fc5b620b37f67486f88f28e8721c/62621952679.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210914022528.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5b0d96c79b355db2fe56ce114d118de2/16901505284.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/puxilotanirosojiwejapefa.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_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 10404 bytes
SHA-256: 157cdab750924cdc7d5bf27b615d4b53a7bd9f387dbbfa71e29e70c42f44d4d8
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 18416 bytes
SHA-256: 68727868f701d04ee92718cbee9f0f7c58b143bbc68ec81e107d3c7d9df89534

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