Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e03aadf57c226d2…

MALICIOUS

PDF

86.3 KB Created: 2021-07-08 09:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc3ad7c944bdc56e6ba2739d9443b36b SHA-1: c52b941c7b570adb4c69ef0e1a5854b1dd365e6c SHA-256: 4e03aadf57c226d2e65f757fa5b43f96dcf3b68948960a2076dcb819e2d39711
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point to a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=zofran+dosage+for+gastroenteritis+in+adults
    • http://kingcraftviet.com/uploads/ckfinder/files/97150760340.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/876b6d7f288c6b22ba622d32e28c36e9/9541452922.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/0da99206aad55ed3d3e0f6bfc4ea6260/tezawuxurekenawiz.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984fcdb2bb2---vofedukizodumesekewur.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f49d556a773973399feb1552b2503cab/tomovesijojedo.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/08c00a429d8509797341c48780b17b8f/80247885736.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a540fb9b---99624562038.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/nafopenej.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dd888e62cc4d3b923a52716857dcb7c/tulewenavudirijonivuwi.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/63f12141d51df26e463276b0b35e7d7a/ribodijugaresokes.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8na5a01fstjto2ucl6np55tpl5/wawizusabanetevagu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c53367c05---lunojene.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/32qjs09btlb9c3uk5csbfg9m85/pakimojenek.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kepakewikej.pdf
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/kefafosubuzotazuteg.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6e7e16410ba9a3242533fa29e04b3df1/laluriw.pdf
    • https://sabagdasarov.ru/upload/file/46970241133.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2tc2o00oujle23dfah6vf5rdh5/2156263319.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/gafabaluwujulinomi.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd229c2b8---50146055871.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b30a51107---29576847407.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdbc50b38e---zirubuwetal.pdf
    • https://mmagame.com/userfiles/file/lovekugagopowadinukepaju.pdf
    • https://dancleland.com/img/upload/file/22560790985.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0b5872ceef368491ae3e5b42f13bc4e6/90700648284.pdf
    • 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_off0000ee80.bin
22ecc269836f70a4d247a1f6f8e5c6f68d81f34668dc03e6f233b56ba433f98b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 10592 bytes
font_01_sfnt_off0001069e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 16792 bytes
font_02_sfnt_off00011eb0.bin
5aef443113cd661c1fe0e2094c9e36f5f18eadd728b979c8ecd051c36d6596b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16584 bytes