Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ef34722c04197e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 21:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a910ab3931a711446fc860d4281a98ab SHA-1: b4c1708db173e9d77f12f2ccbdc57ef18312e245 SHA-256: 97ef34722c04197efeece7e71a38d63c269a00650471c1a7efed3e42732bd4ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=vocalise+rachmaninoff+piano+pdf PDF link annotation
    • http://narnivet.com/userfiles/files/37244341000.pdfIn PDF document text
    • https://abeess.com/userfiles/file/99352086570.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/37964526279.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7e16e1eb---14195516553.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/66636850246.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/59e9436d47eadea3bc1a6272997d01c8/doropas.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/32074927076.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/1751628203.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/maxobimewegir.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/japikimo.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/zejifimuz.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/95319444686.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e049bf0332240cabc7fed6ccd0fd45d9/45683120279.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/wokamiwaxaxupuso.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/53e31840e338cdfc91f46e37d639e1a2/kedepukatowikadobip.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/78435009361.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/i2qg663jri0r8oglu0e1n4cbeu/70118383832.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/koribima.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/23116250425.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/luranawinixuja.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/kiladenisuvimazotam.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160780c52a57e4---mivetepuvonuguriketekoro.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kanavokikiliji.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_off0000be84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 10756 bytes
SHA-256: 59c41578a34c6788d9b5a2c3840421bd3e5a8db441f70f640238f9d94c663891
font_02_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 15480 bytes
SHA-256: bde4f82c524fc11a33195d772fce1249a009f549696fdc0af74df9e21e8ca6ae

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