Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a2bf8b1e09be85…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 23:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e03b5cce475df1fef54717439e93bd6 SHA-1: 97f9a03c9a257e26d342f5b8ae615362464afb75 SHA-256: 20a2bf8b1e09be85ee9d4d07cc4c6e8a84967caa0591cbd7e6a5e8c2fb89d3e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. These links form a link farm, likely intended to redirect users to phishing pages or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=dometic+refrigerator+dm2652+manual PDF link annotation
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e78220f6c5e47982888d7d1eb17fafae/jasutarolalujogaz.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/d53g96u0atuur3uoaahbl6gutn/64198681183.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a36f14dea---41859165407.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/bozaxenafowekevamodi.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/64120113162.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a113ef5f9de---nesebubimematusugebisoz.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072528c584bf---kixoteniwuzeki.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/87599230923.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/ferozuniwitiziti.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/xipajimivugubedupi.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/lugurujojivokab.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/dovijebevavegikidozi.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/85359119262.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/bawebalipawudujukimiwukon.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/kevirobuwezonitokubebav.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b613f97e31---dopogotobeki.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5b632b71572113cda5d314237fa78a2d/kinapirizekaragilokun.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bf6d65206c835c5fc59c95c4a41d0aa8/fetirafilajawupuroge.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/fijiwalavijunagoz.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/desajuzexirap.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/38811989588.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/48175359794.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/41734729978.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/46186459282.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/rovutibeduvalotumileris.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_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 18460 bytes
SHA-256: be01d8550710f3b292dfd486cf5c25cf047bfb719fe5d8d2215d9f8d90019ab9
font_02_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 11176 bytes
SHA-256: 2e5b9e1a2c70e97759cae123bf1dfd046b07c8a8f01a9d2086d3ba96dbfb65d0