Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3b9569dea9736e…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 09:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d96e6282f79f533853b44477f8bd8d5b SHA-1: 6c6022d9c60959be073f224c39b20199441c3377 SHA-256: aa3b9569dea9736e79195010464b9c895415a5302f034722a56960ead1e35521
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rollfactorytogo.com/uploads/files/33931148591.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/916106cd4bc1045459819172fd0d7a26/44694587017.pdf
    • http://sarljarry.fr/userfiles/file/95323246460.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e6b424f7dba013090a94065d60d553cf/gatuk.pdf
    • http://czechdidgeridoo.com/admin/upload/file/nudevorivakamadi.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da465ff2ef1---nefuluxusonulaxupiziworox.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc85ed722---kixodukej.pdf
    • http://bettynblue.com/upload/fck_img/20210518/file/73929778265.pdf
    • http://brooklynsmokeshops.com/admin/images/file/disomijaxamowup.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ca3a2690---57466703571.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bfb672e0d---satepamenedorebewunisovit.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh1u93jrlkn8bs922tm3lmo7r3/dutarotejafoziregox.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0253c43ce2---wusizozojuxomoxawusadete.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210601_780D5F1FD5EC3586.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2af1c5cc---40975985845.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf236c27e41---xibuvobo.pdf
    • https://balajitutorial.com/admin/userfiles/file/jesukufegapojonal.pdf
    • http://chinasoftcore.com/userfiles/file///nanegerolexupemar.pdf
    • http://worthingtonpark101.com/userimages/logojixapipawuraxaje.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d62afead53e---17395695169.pdf
    • http://kfbi.ru/content/file/87071792850.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/tvuq209ghvn6u49qau1c8ts9a0/wolonemotujazoloz.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/12bbc2b76e1a1968b892f635ecd4987d/mukirumit.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=integrity+meaning+kids
    • 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_off0000f6b3.bin
667c4ff25763890b308e0a76076aab2063825c922444db94ab55a03f9e643422
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 10580 bytes
font_01_sfnt_off00010ea0.bin
1b58d81ed49e007f77d64b0dd5c17a2b5e19fe1715985f0e0b730d9b925684d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 17204 bytes
font_02_sfnt_off00013b40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 16792 bytes