Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2ea1ff37edf0ba…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 17:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fba123b309f1c7902cf2604a8b9daf33 SHA-1: 3d244c70ba555eaa2b1f7d9970c3c1104088ef07 SHA-256: 4f2ea1ff37edf0baa102a4f7340032b78389896375401dac2b9f668fc6e97e9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS further supports its role as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://paysecure.ro/ckfinder/userfiles/files/roxurudivoxifudakuso.pdf In PDF document text
    • https://titishop.co/upload/files/85991993409.pdfIn PDF document text
    • http://inistor.com/ufiles/files/43500939412.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/e9862dd57e8746b9805f125746f5db3a/83240909556.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210912072949_tudhy0.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2aa6abbf---10284970727.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161399bbd4afe9---wofud.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/rejadikizit.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/xozotal.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/lotitifari.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nojowetowidebokuxi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/93232515493.pdfIn PDF document text
    • http://superazs.ru/images/news/file/nosajupixajunuvower.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/zoroxo.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/5401712697.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/21053003271.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/dozidevasisonutuforeteke.pdfIn PDF document text
    • https://priscar.com/documents/files/22945685419.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908002216159697.pdfIn PDF document text
    • https://durimawar.com/contents/files/pumoden.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/jilelagigeduviviro.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/42095267537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+android+games+graphics+2021PDF 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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 16912 bytes
SHA-256: a749b0a7ff9a2f3a8d95f0f589b28d6a78f081e8df01b45e3e91359973045f4b
font_01_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 11264 bytes
SHA-256: 8b837524d0ca331adfdbf57eb0529f3f02262507eb4bbffb80fce91391e360e6