Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f21eb63074887ea…

MALICIOUS

PDF

88.5 KB Created: 2021-08-09 09:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c16451d5d5ac8267701fa3897e91fb8 SHA-1: 6a6d3493a58b7c887fa84c721abd766fc3361fda SHA-256: 3f21eb63074887ea60e873eeba4bf41ec6c81dacccdec3ceb3ed885d7da53c42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links pointing to compromised websites, likely serving as a lure or a distribution point for further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=watch+the+passion+of+the+christ+online+free+english+subtitles PDF link annotation
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0le55bnf20kpbtupj0a4vqpu5k/43271244091.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf711b7abb---wefekamovajubivu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/700sb53626pau0icug48oe0p83/napawanovidepisi.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/72788995702.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/28104756582.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/50313661087.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fb780c4b6b369ec30cad1d049fc2e78d/15855396273.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210702141100.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4a5c7292---pomovulijewotidedejoli.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/sezapi.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/ribawaza.pdfIn PDF document text
    • http://slsnn.ru/content/file/26126708027.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/54494296941.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091cfc1d0a84---14587842533.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e85d84a76ea---66072111671.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609447fca092c---xedepowano.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4f8574c4eb4f3e8682c981bb6d190bfe/38837039470.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/wovawesaliwerimibe.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/85718475168.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/70780130138.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8b8ff6ffb6e09b96cd7c3b557db0eed6/xenazejiwaxozuvofijakoku.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/35171297810.pdfIn PDF document text
    • https://drsaman.com/files/nazuzojevog.pdfIn PDF document text
    • https://seikico.net/img-tym/files/jifizatuzifunebovezev.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bebagofowezizo.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_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 10992 bytes
SHA-256: 9551ae29a77158c9d47246587353003218f95ec37c546b5e8fce9975b69cded6
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 17212 bytes
SHA-256: 5f4a3f5e28926d5d722e13533ad1ce4d530f4cc93f6c72525199a44155b985bb
font_02_sfnt_off0001394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1