Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b222e8d956b3b56…

MALICIOUS

PDF

95.1 KB Created: 2021-09-06 16:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11a7f9e8013279891adbe823ce02a3d5 SHA-1: 11f7ee0386e71895ba0b16ef74843d4a953ec128 SHA-256: 6b222e8d956b3b567df978bcbf19d9c94b091c7b6e2fdf2349240d4525db9300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://queure.ru/uplcv?utm_term=ligier+js50+owners+manual PDF link annotation
    • https://fivetc.vn/uploads/files/xomokuleg.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/58449350053.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91b555917---25741081862.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/k9bormntm276m7vvip0fgkhma3/6030630144.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/jujudafedadugozogajibot.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8618c13c87f4aff4c27862b05e8e6660/gojapobubu.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/mamasimufago.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/g15mili9ho6j50ff4672rtgrcj/33136999216.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff2b151af0---xugom.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/2720340758.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a480a9518---61780715917.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf96v9ied2g5qi00jgeed4h510/33445294421.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/93099158457.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a2f7803ddcdabb72fd8d116c7835a83/26713049165.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/sifiwevum.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf3984af5d---5935523848.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacd8eae86---zibasuximu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8c3387de9bc48e23b8d03ef14cf540c0/84248655553.pdfIn PDF document text
    • http://garderoba.sk/images/_file/73534207256.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/jutapojimarajofibagaruf.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb140600e3---71261524661.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/zojimipagi.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/geruxokalujuzupidax.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_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 20744 bytes
SHA-256: 536fe40eb76541cae0cbf4a376b048f19d1dbdec16d6c9d32b25f64a1bf12c3f
font_02_sfnt_off000155fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FD 10884 bytes
SHA-256: 3877d7fdf21a5933287c58b15828c73aa397e2b685f65bb80c4aece0cefc82f6