Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f53d01fa33afb42…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 12:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 885fdf218c32f0e56038610d438672ab SHA-1: 1231b1f105201bc544d9b90602b4a05945b95bf7 SHA-256: 6f53d01fa33afb42831ebbc7548a1ddc77dc214726cb8cc1fc8e18eea2a26fae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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=glutathione+containing+foods PDF link annotation
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f912bf18c912ebe9bba74ef455e44e3f/97799104616.pdfIn PDF document text
    • https://aitalk.vn/upload/files/zibefuwebajuj.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/11e9951fb47084826f218c678e6ffcce/66138421157.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/28280819654.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/toun2d80iboika4crbpufti2u7/zabifitukewexowujuwosane.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/889f96cebcd5456f96fa340b41083ad9/38130377766.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/rikumej.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d32de13c---melafakobuvonosos.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/37452888250.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b78d854214232bd1f4c45f088d163941/rofodelikasajemomi.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60d0125b0f491.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/dezexumokumodokeve.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0cqpu0mpel3anpe7ep6rbuhgh2/virunaveme.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/3pg76ifpn0k67gl7e7n1hcj08d/27532106380.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/16976210402.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/jgsk0vqmuevfm7bnatam4a1ahl/14330175738.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7eaf8218055c9d67ceb8efee5738e5a6/buzufivafulukagunaga.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/berol.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3f9b0f4c---rajaguda.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/de654f33b0d8b9a63566ae2220987b23/6638013844.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6e31b95c2767fa7a54639ab8951251a4/35536179100.pdfIn PDF document text
    • http://jarosi.hu/files/file/livenabuso.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/bigebazozukemilawo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/gisuxabeguj.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_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 16780 bytes
SHA-256: 00db2e6bfba410aacf4f824db1c373201e5ba72c6801974fb027c80a6f9e6b21
font_01_sfnt_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 10792 bytes
SHA-256: 08157b3fdc115192eb15a83d1a8c07b32740fed1bdff34ee75fa5802b0793ca9
font_02_sfnt_off00013692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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