Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdc2f794a8ccddb…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 23:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 588b84a9718badbf372c1ef5aac6ffdd SHA-1: a8f52ec8d980e54e01f81e31bd3a33947e120cfe SHA-256: ccdc2f794a8ccddb20f5be1ee23a90817bed6e5ad0e66fe6100d874edc40cdfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external domains, many of which appear to be part of link farms or hosted on compromised sites, suggesting a phishing or malware distribution scheme. The PDF structure itself, while not containing readable document body text, is indicative of a malicious payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=myflixer+tv+app PDF link annotation
    • http://villa-margherita.biz/userfiles/files/44855774379.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090406331930.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/27251403862.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd6695859---nojimujagefibeba.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/mojuratow.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff58eaf73---bebalolesuvijo.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210907_259DE7D1CA81C1A3.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/46200328604.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/gogulonogezutik.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/monemixavo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090601481853.pdfIn PDF document text
    • http://lactopad.com/uploads/files/tarofozopaxij.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130666b79037---15328755322.pdfIn PDF document text
    • https://membermimpi.com/contents/files/22059809261.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/nasapapobewifukenunoxibi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613757bc25ac2---14098226806.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/begunajekejatixamobus.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/bepiroronawijapemipe.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/20961452040.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76402679944.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/4550720557.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/60389064921.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_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 10236 bytes
SHA-256: d8b00703445fa748aa7a5bd405d43920b69f66541adad87b63c40051f48f1f1b
font_01_sfnt_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 16308 bytes
SHA-256: ea811b502faac0b48538764a63aa6584fd6c1999b1f2a2395ba834c6753b4e84