Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afcf9c13dcef4de…

MALICIOUS

PDF

80.0 KB Created: 2021-06-26 02:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52bf213d21daddfdccd03c1455b08808 SHA-1: 340a45ba7758ec2bf1e02d4ff8fb4ca81488f947 SHA-256: 7afcf9c13dcef4de9e81290a12d149a385b4aecbd817306420ceb1d65302a0b4
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of a callback phishing lure heuristic suggests the document may also attempt to trick users into calling a fraudulent support number. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=chisago+county+mn+jail+roster
    • http://centrumbiznesurawicz.pl/userfiles/file/60675139319.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/32870898696.pdf
    • http://agcslohian.com/userfiles/file/libunivijeriminosodofumi.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a3c87e6f5abf4a6360140cb727bd5547/tekosimepojewexizufo.pdf
    • http://www.ecvbrass.ch/user/web/file/femetuf.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7bfde7b463fc6a17d7f5885709e79373/8675264754.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa610bccba---86710424768.pdf
    • http://charontrade.hu/data/file/xavone.pdf
    • https://floridainvestment.cz/files/file/gebotuwopodifego.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q93akkics68j3ul64dnfg655rb/40241370350.pdf
    • https://bamfieldrental.com/userfiles/file/tefil.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078513755bbb---92041548642.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608166f3a7e9d---79479903695.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081765e53a38---xubotimiteg.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099a293e71f7---xekinu.pdf
    • http://posekatzahradu.cz/files/file/ropejafebozenojikanego.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/xabaraputaputafugam.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a90a2da7898ceef684322cc00e12d33b/74202323365.pdf
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/14570905288.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tanazugaxogesidafexufom.pdf
    • http://tpdw.pl/userfiles/file/16267796487.pdf
    • http://legalinet.eu/userfiles/files/xamozutewolurezariba.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b8.bin
a2f7a57e2e815b0f8d76d02073980f2e3c291b738b422db7846e24e14b7dd04c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16748 bytes
font_01_sfnt_off00010171.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16792 bytes
font_02_sfnt_off00011988.bin
187dc1f9433d5dcedeb30db971c24f9fb14348c478d81ff1a6124e948958dda1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 11052 bytes