Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fdfe741e061511…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 13:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 705fd772264b9aa600b4b1110493794e SHA-1: fa74be1aa9dff00a97feebc08b226485782c5953 SHA-256: 67fdfe741e061511036f8f0022d80488418abaeef7a152722e7bf7bb80fb7a96
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage, suggesting it's designed as a link farm to lure users to download potentially malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af35cc1df0---75139354926.pdf In PDF document text
    • http://thebodyclubonline.com/userfiles/file/40670218241.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/51568611156.pdfIn PDF document text
    • http://annabarons.com/files/files/77308826183.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/pusiriwezijima.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/64892142601.pdfIn PDF document text
    • https://pepsima.biz/files/file/vipojeroverozopujinapono.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/29681113050.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nagapetub.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161394b8360448---88784290242.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/9209656901.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135027bd352f---duwevesuluwemibabul.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/todak.pdfIn PDF document text
    • http://secoinblock.com/upload/files/68185742850.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158b874896---pefiluvip.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/78560869388.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/70012415289.pdfIn PDF document text
    • http://airfa.it/userfiles/file/ribipararomomojafi.pdfIn PDF document text
    • https://norservis.info/files/files/jolawimekoresiwefuki.pdfIn PDF document text
    • https://activepymes.com/pub/file/80977729699.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/pukomidibefed.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4b3d72c4032a3571d6f589b9c73aa0d4/61616763276.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/novobefuferez.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/mojozimokinopefare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ben+10+xenodrome+plus+apkPDF 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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 19396 bytes
SHA-256: 8028fefdd579c4fbc0f939cb8cf294bbb1b22aca59253ba4350f1b62cbcc08cd
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 10884 bytes
SHA-256: b88cbe931135dcf40b4d916720ddb8da7191b6ba386a462e185198bce1a247b3