Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafcf4860c94a454…

MALICIOUS

PDF

77.2 KB Created: 2021-06-08 22:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab9d588f8b8a4f8b9c436f75dd5f1355 SHA-1: 56ccce02decd5d8136c40cb3d4efcc15e1a06984 SHA-256: aafcf4860c94a45475cfd1528fc34fed3f0a616b21b03bd11bfc11f97f4cbc79
204 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is intended to trick the user into believing they need to provide a password to access a downloaded file, which is likely malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=miracle+thunder+2.82+crack+password
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/cdad31d87c63d98bfcb3c89e4e7bda7d/lasexi.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5ae8779ab3270c1616cd23717e46b801/82961374717.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090ebf08e28e---46583001384.pdf
    • https://alajuusa.eemedia/contents/file/dafebuvakinanalisakavil.pdf
    • http://fly.no1-yes.com/userfiles/file/91899825965.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dkasuub2ot3q7lpivro2a3sbi3/42783313273.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f805455101---66841886874.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609042908ca7b---94624935762.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e6ecf32b5e61d539c093fd78f816fd55/filaladafule.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/m3l47rmjjhftbsk2h1okfm0amc/bapetimelokutoxarumuru.pdf
    • http://dent-pro.cz/pic/file/23510343876.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d3db4b0ef3fa5e6e8e2b797b3577619a/vewexopevupunazumiruvuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed1.bin
3e9f5273b7569d28d52f0854e0902880faae5bf0e7a4f8e171d3f795986e514e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 5680 bytes
font_01_sfnt_off0001023e.bin
2751c90659fe808d47a978abbf186c789978bb52c20d0e649d8deca68e2fca0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 11168 bytes

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