Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa81e3a9db95007d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-21 17:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bcfb3df8a9b492e0715519dc84acf8e5 SHA-1: eae07c035296e4bccbb02904726ae668c749532b SHA-256: fa81e3a9db95007d79363e9a3f7c83ad8600f17dc3f21c1da64dc3132bb016b2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the true destination and spread malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kursadowicz.pl/Upload/file/3448947862.pdf In PDF document text
    • https://devcons.org/uploads/userfiles/files/fukijuxibekowuz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a6eq2ea401aqlka0evb11abgi0/96083858069.pdfIn PDF document text
    • http://mosjob.ru/images/file/tevokajewikorafejozakutet.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/34c932928596ebb136103b01d19d3f09/7677128383.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/xojanuraguzivepexira.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/235d6e4e1639150ae43fc06caff2a56e/dikokavowi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d667ef27d61---57018017871.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/sazototeje.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d438c9b6---roxozusofagamuwepebiles.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f455c3baea---mitatijamegujanoturumitaj.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16085b64dbf690---10556860210.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/28gro5f0eblstc648qnqietv15/49901634787.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d13455b3---xaxopubadajeratel.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/32622058208.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25938bed8---77104477540.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/21843938164.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/1486106925.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/tazipubasawevonemugep.pdfIn PDF document text
    • http://africareview.in/userfiles/file/rojofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+sell+your+cars+on+gta+5PDF link annotation
    • 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_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 17324 bytes
SHA-256: cc46c4d6fc245a7dedf7f3d07a47000ed3e028ac7c101343495e51b50df58843
font_01_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 10692 bytes
SHA-256: 44e7b291c9cbb5fc285f6ccc273db30015674b4bd2559963e14c09925be46f67
font_02_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1