Malicious PDF — malware analysis report

Static analysis result for SHA-256 5142007af2743662…

MALICIOUS

PDF

84.8 KB Created: 2021-07-07 14:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 11adb990aae5d7c486e9f478da784402 SHA-1: 8779742a1185a035160cbc7242f1d1c763fe86d0 SHA-256: 5142007af2743662fa5aee385cb44c40106a0b3524927f03b89003b93fbb9a1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ketchas.ru/uplcv?utm_term=causes+of+dental+pain PDF link annotation
    • http://metabolit-plus.ru/files/file/18251259262.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/22343ea33a69d524750e01a6d36a0921/rozuvidetifejomunulik.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/catdip3od7oasnogk70su0rnh5/bazezazofilani.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/33547700338.pdfIn PDF document text
    • https://actorconseil.com/files/file/madubibifitovewin.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5b1a1785---kekowefirarip.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/dusikewot.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/sipigivekuduril.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/88094385866.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/bubizepa.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0643859001622884411.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4ddc52d9---95796448957.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7fdmb872jl2aqpvvin7nk5qio2/wunanamulezumi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d6d55b28---64371894012.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081a7b50f27b---kejegikagovewojeti.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/74656929932.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3145c3aed---39009633295.pdfIn PDF document text
    • https://aspirans.com/files/file/taxosuxumudiju.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/20047163816.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oc6sl5apr89hq47b1krnlemp1q/zomidavusaberobataj.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/lofomavodatimolesu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160e02f447184b---sisajil.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1b669d776f1a656a49596a743921152a/nefobizafenurerunositole.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10520 bytes
SHA-256: 08305644bc85872fb6813fefb1798a926dafb0be49a5b669f64a946796079647
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 16928 bytes
SHA-256: 04c30fa57488ad7887a395fe921d08196494d4fd1b786f87d5dbfe6c9d0833ac
font_02_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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