Malicious PDF — malware analysis report

Static analysis result for SHA-256 755d4c88a3474688…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 01:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95ffff0a8556b3939f27f4aef257f916 SHA-1: c4cb0f1a2d9cce71300a23bb1b33a0806f41d480 SHA-256: 755d4c88a34746883caf1c09546e3744f5168fedfa52dc5c66806e4be89d4e2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://trivio.it/userfiles/files/megelosumofekixavar.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zelagegujej.pdf
    • http://kledingindex.nl/images/uploads/33984564155.pdf
    • http://patronusalapitvany.hu/public_html/upload/kebojetimunelaxezo.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa5d973ab---22487824751.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/18991601873.pdf
    • https://hbfilm.ca/resimler/files/kogodexu.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///14078195276.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/jowikogilesaweseben.pdf
    • https://callmarkinvestments.fortunekenya.com/callmark/files/sowofinisiwovede.pdf
    • http://misosmile.com/upload/editor/files/midubepetugatirulidugimi.pdf
    • http://ocung.net/img/files/naxajimukabefezefivad.pdf
    • https://pvesc.vn/uploaded/file/wetavujifu.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48fb3920e---belilaboxedebemar.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/juropugezu.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614397e0a3eea---wivutepogatina.pdf
    • http://kawoka.com/userfiles/file/58823526382.pdf
    • http://dragonspond.com/uploads/files/kekegizupulegip.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/rerutojawuj.pdf
    • http://konferencii.org/web/uploads/assets/file/dowitepepami.pdf
    • https://tranhtreo.com/images/ckeditor/files/pefemetan.pdf
    • http://stepasidemedical.com/images/uploads/file/8057878485.pdf
    • http://fra2ange.it/userfiles/files/82319659391.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/61206258497.pdf
    • https://moiatakashta.com/userfiles/file/kiwovepikirawaxum.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/vupikomuturifexaf.pdf
    • https://olterus.net/contents/files/jeperamukimurekopabaki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+ds+randomizer+rom+android
    • 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_off0000e4c9.bin
960bd7119bca541bf47ba3e1c886b77f583c4c760e0c43d6c4015057b5e95d50
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 10420 bytes
font_01_sfnt_off0000fc65.bin
ec2733cc98caa4a8a20839460230611eba5db0b6f0b59e2c487ed64e431a2725
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 17820 bytes
font_02_sfnt_off00012a30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 16792 bytes