Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b2dc9269663d6b…

MALICIOUS

PDF

88.6 KB Created: 2021-08-03 17:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e20ec334bd2ddc7ad286fc021dccb96 SHA-1: b6aee3e725addd4418648ede39d21ed9f3b31a7c SHA-256: 35b2dc9269663d6bc26bcad23919485b144ccce05fca6c0b42bcc4be1835b1ee
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=force+and+motion+lesson+plans+8th+grade PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c7e7c864---30189991058.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722291c02ee---53928414260.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/lafivon.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3844402398bf117906e135e424785800/32291292926.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c4ce91b9f308f3556e4bf8af7c647f38/56852125551.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab66be3b6c---62947040742.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/93399eff9d05aba954097cc66b65b718/konatuguzemesunuwope.pdfIn PDF document text
    • http://michalbaryza.pl/ckfinder/userfiles/files/pajimekatutalitu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021060815204028.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/cc454589cfb5238ff278f1b97eb5677e/gedametune.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3449b32627---38307183320.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608787235542c---juxewubuzupixizejoj.pdfIn PDF document text
    • http://korytnica.net/data/files/3851147304.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/6758979835.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/86649201145.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/8253984229.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a404571ce---jidajuruketilapodelovila.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///lazixagox.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/14848100104.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/dokekamor.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/84938843931.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ed91c0fa---pagek.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/boweretipegapugosub.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ad8a11d6d67ded242f5560bd0b5f5fc/32167832049.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/jilojisegokixaburenef.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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 11144 bytes
SHA-256: 2d16b2ccaac20d7f0d3f5d9eb9b0f1d37d2d2e7415e0e89b7251a4f24bd17720
font_02_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 16640 bytes
SHA-256: fe18a43c14a0319980d0184a8580462454de8ca6065d75f0ab95cc0e9c3774e5