Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fc6d93df7ac75d…

MALICIOUS

PDF

94.8 KB Created: 2021-06-29 06:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88cd77ff71f40624bcea30814ed656c5 SHA-1: 30b5fd6921441531d929700b0bb35b9981db0fa9 SHA-256: 65fc6d93df7ac75dd87af5347c68289ca620f355d562463db55cd7fe2c5b9a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://peak-experience-japan.com/420343866.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098412a2979b---zotofakijaborute.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ad18c7a7---kozimuvetisobulirogogew.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/539e1b5fd864492f2f267d5b19fdbb37/83980651888.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2229b7bb9---88007677951.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088614e66a7c---jakamegixetemeweteba.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08ef6cd7d---17187629905.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cecda8121---77701033904.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af696f4c8fb---nerewavosen.pdf
    • http://angeladaniel.eu/uploads/files/91319747541.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9914f86d---10569420832.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4273be67a8---52038469406.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0l747oc7mrernbi5lbijgtsq79/sagawix.pdf
    • http://meble-tk.pl/userfiles/file/mebesotelorafokegupigizuw.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd1b80e131---guvezizutagu.pdf
    • https://guapa2.com/admin/fck/file/58981073915.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608896837b385---42882907794.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16244373196879.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/jetidaveguza.pdf
    • http://hotararicedo.ro/files/files/24003971488.pdf
    • http://andlupa.com/userfiles/file/85968254874.pdf
    • http://studioarchperissinotto.eu/userfiles/files/73298010092.pdf
    • https://yepsell.com/userfiles/files/20370271298.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/782c0c1f1625897d70256b75b2bd29a7/wotovekudefafafupuzobaviv.pdf
    • https://aashianarealty.com/file/8458322353.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=symptoms+of+heat+exhaustion+in+adults
    • 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_off00010d98.bin
1ecd6a80791cc00ead0b5e291fabc88c206d3ff7e15965608955f473148b9747
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 17952 bytes
font_01_sfnt_off00013c01.bin
d6146feb92cfe1264d7c9cabe856a2f9b89f32de5724f4753a932f625e5693f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 11052 bytes
font_02_sfnt_off00015594.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15594 16792 bytes