Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f05515f53e67ce8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 15:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed7f217ee1cfcfa580171a628246623e SHA-1: 1222bd70bebd21eac32bfa343b3a8c7278dbdbd4 SHA-256: 6f05515f53e67ce8d6491dfbade8ace29cc1932bb44eac91dc4bb3efaae16327
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, suggesting an attempt to lure users to external sites. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=advanced+10+cae+practice+tests+key+pdf PDF link annotation
    • https://greenbins.ca/ckfinder/userfiles/files/jibulunozodevubuvugep.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210919164820.pdfIn PDF document text
    • https://birudongker.com/contents/files/90918103891.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/xemexedijuwa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7f6c814d---wefofa.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/nisuxuzi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/9071454834.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614818e582861.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/gazifuxuvesezakal.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1misjl37kjcnahkmvd818kkl54/47855570712.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/sigalume.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/sadupizumotuko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1fcbcc2f---dizekujewalexezotoxeve.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/motoxi.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/46578775541.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/46072008798.pdfIn PDF document text
    • https://produse-zilan.ro/files/guxabozivipewogedu.pdfIn PDF document text
    • http://vlajamo.cz/images/file/80075079800.pdfIn PDF document text
    • http://ministerium.pt/files/vanevarex.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5565c30f37b6dde9e45d48e0d9d0a3ce/90666758021.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/76393942700.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/jinumavufedimusujujiduta.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/64294953108.pdfIn PDF document text
    • https://granitnet.hu/editor_up/63900600440.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_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 10872 bytes
SHA-256: a7c6d1a08bde11e5ef9d9e931bef918d8d183589e33c314bbd5a355e166da1ec
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 21592 bytes
SHA-256: 6821cafd58f22cd07bc1658126dd595a8da2506ac18b5054eca3488f70342f7f

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