Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c7f4197b3fbb96…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 14:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91eb8a505ba80692d88cbd496f2e1103 SHA-1: 69945bc125c357bf1568041050e88cf7efec89e6 SHA-256: e9c7f4197b3fbb967910b3687113807eb10d1cc4e5472ad50419847664940d07
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure due to its small size and the presence of a single image, typical of a screenshot designed to trick users into clicking an external link. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a distribution network for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=watch+films+online+in+english PDF link annotation
    • https://dijitalsanat.link/upload/files/vokumazurovivexiba.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/24987134613.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/zepovo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/savoranodusalojuzakegijis.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/17593544596.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b5eb63d8403841e27100e1a8f1253c5f/68688051694.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/61597893734.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/49402965829.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/ropuxus.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210909094857.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/relotesibexi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded8a94f78---bujuvininirafime.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/55975923515.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161465fcf081b8---dadapitutafirus.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/45374089121.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/27ccc4317240c88a9f3b74c80e350e7a/pinazamasizedowaborofin.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/29110343630.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-23/20210923163346884675.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gexano.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28b4dfea9---varojozamoredowibi.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/28663820421.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4ba51933---pavesiligorabare.pdfIn PDF document text
    • http://bienbao.net/uploads/files/fenib.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/wamuvobox.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/12442273485.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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 10676 bytes
SHA-256: bb43ae668e9ae8c6e32944605e3bf16cabeb75419cd27e8dc0fed72a1cd7ed3f
font_01_sfnt_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 14120 bytes
SHA-256: 3c02f6fb6356169df8f3baf6f7850717b2ee05338190d1f0d29d96fc2b373945
font_02_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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