Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0f77f91c523a39…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 16:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4a2b321deadbefa69ed0eb343f3fba6 SHA-1: 639f76997b65edf6a7c2f926610b0c59c4eca7a9 SHA-256: ab0f77f91c523a396bffb51a51f4587e01a3e9eb92f65f5388d0c36fd107fb1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0b00be862a0c6da72cd6afa2a1e03e76/gebegexuvela.pdf
    • http://easyreturn.store/userfiles/file/73544426278.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ojmt6ou83elgso5pqf0etfiisa/12197997106.pdf
    • http://paitoonbox.com/userfiles/files/5001304622.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38b65e88d---zafoli.pdf
    • http://maasmartcity.com/userfiles/file/81098328897.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a0e04b17c4543c5fe2bca7a5c1968d34/96612912321.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16095408ea5431---gupozutalinu.pdf
    • http://hnc2.com/userfiles/file/90558628128.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dadf1e2f0e---nubuwotixenoniduxela.pdf
    • http://anatolianlgs.com/userfiles/file/79424054404.pdf
    • http://caphegiabao.com/upload/fck/file/simosapos.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/241c12bb035f22d0209c2be03e815878/82173245701.pdf
    • https://agrimal.pl/userfiles/file/fenalesuzerelibelajur.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be6853183---90898375905.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c2dnts4nruuhmfntn9m6gpnjhh/98629279648.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+insert+pdf+page+in+pdf+file
    • 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_off0000e521.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 16792 bytes
font_01_sfnt_off0000fd33.bin
2eda034f5ad66e097b82e0b2a0a6dc14de7d8bf6aed75730cc5f34ede83d618c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 17504 bytes
font_02_sfnt_off00012ada.bin
c0009472f84a4926bd56f138ca06603416ec2b19d64bb41373bad30af34e039c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 10748 bytes

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