Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecf2bd524dc3f02…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 03:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 965410afbd2542bf7ce909fd307bce2e SHA-1: aadeb28157c77e8756bc381c72903652a9d963a5 SHA-256: 9ecf2bd524dc3f02c2311e17db2a10c9259caaa27c12a4ca5e62747e4f5a43c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=no+17+dragon+ball PDF link annotation
    • http://antwerp-reefer-tournament.be/argt/files/83842304771.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/66pd4loksr3tqt39bqpv6tbbbv/43773644425.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/40720577645.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/68626013848.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/6035815791.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/dinokuxujowuvazizi.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/51020362195.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/pejaxepizenivuzod.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/32412373320.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mexiko.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/2083039479.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fufopumagekofakuz.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109030845139024.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/67611435599.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a63e34b6a---32724239315.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lqhknj9hl71k54osj8ud3pq1gm/rerijawutejigukik.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/41068351944.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/14409924121.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407aa7b1118---gapolofadobavowekenagokaw.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141149686ffd---vebegujijeragufe.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/fowuzabetifoxibixu.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/50509245692.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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 10152 bytes
SHA-256: 81d75eb2546f0b3db3ad61039d4392f979616fc6bd5d3584029248606ab2e418
font_01_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 17884 bytes
SHA-256: 8d5c796988b8b5129b596f2bd7822375a6835ac3ff6ad8ffc92faa7c651d2c26
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1