Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f92c23fae2fabe…

MALICIOUS

PDF

84.1 KB Created: 2021-08-16 11:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52065101b2e8527a58bdfc86433279ad SHA-1: a600872d6ac7afe6a8d1f565a319739a3403f678 SHA-256: 41f92c23fae2fabebac4725819d2ecfcd0fdea80406bc1927decdb8a82d6a67a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into phishing scams or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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=essentials+of+management+information+systems+thirteenth+edition PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b311bc36393---79915979243.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b8cf0dced---45033885956.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/81604287059.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/palozokarisitivomozufawo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d426ee27---17352457407.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907162e197b---64830162790.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/80ae5573e3d8946d351c564095c2a1a2/jevitojol.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e120520059---57086447251.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671a7261c3---vezorozotojo.pdfIn PDF document text
    • http://apcmagon.com/userfiles/kovurowow.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bsvfii7bvsmu9repsg9m676usc/pivobawemobixufufin.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/vebize.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070175b90308---soretuben.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/12923608323.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/23k5t6n4dhetit98o2qefr54f4/bezakomojaliguban.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/97926529753.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/bebokigeruzirusu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0jn4s744c4scd2fij90v4lt4g2/kipixerusirupadoro.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/dutosekizeragapuzesoj.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/puwidenojenela.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/zetozijurozugawu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1decdba0---92529534123.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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 10900 bytes
SHA-256: 7202e95e28f8937d230bf859b16e1c6138d81c838f2724e2f498b83fe45617f1
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 16476 bytes
SHA-256: a963ba6f3dd222f0bd909a4ca605cf24ed94293b3f5ac30cfc33547da8103adf
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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