Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b797dd3a0e4690…

MALICIOUS

PDF

99.4 KB Created: 2021-09-04 14:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1923b91392dde7711bc94fa995d8ef3 SHA-1: 7132a9f641c8e6b92152ac579f4f0213f90a4814 SHA-256: c2b797dd3a0e4690ad5f449969cafabc17518cb6201270cc24b726e51e4c0c7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://crysiq.ru/uplcv?utm_term=empower+b1%2B+pdf+descargar
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f31733eb3---rofewaferodigitojog.pdf
    • https://rocksoliddesigns.biz/userfiles/file/palamozoramenizovori.pdf
    • http://novussiteyonetimi.com/uploads/file/45222960017.pdf
    • https://matagujrischool.com/admin/imagetemp1/file/98044973044.pdf
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/20873883115.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0f73k7cpf4gc1nndikcp5gjvr7/70427321941.pdf
    • http://surtek.biz/image/files/20150119_012945.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/56ibaqa9tecgvglnsceve786k8/biwepeli.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607488317cb20---69085641775.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2cc1ddf8735b67071fc4ce013f72d67c/50955859791.pdf
    • https://imagebeaute.fr/userfiles/file/gefomozoji.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/6bad8944595681e212ca6667bbda6270/42101092268.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/m23o5bjuskf536linpte294tng/rujuwagime.pdf
    • http://morgancountyoh.com/userimages/bexukemonotunakojakux.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a45fa500d9b---bivulikafotivabutaz.pdf
    • https://ludifrance.fr/userfiles/file/xikidit.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8s3ekubpgm667ncn126ebon652/7049835546.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/59069680666.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/gimuje.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ebbeaab9c---rizodigizirusi.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9ac629766ab5a9870fba478f2a670e3c/68380573599.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713cde79f08---20652124854.pdf
    • https://suma.ca/upload/editor/file/41002671057.pdf
    • http://n-production.com/upload/fckeditor/file/jitigunijipelinigofiwire.pdf
    • http://energyexcess.com/userfiles/file/pirosor.pdf
    • https://topupdana.com/contents/files/29017802594.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 16792 bytes
font_01_sfnt_off00012c19.bin
ff8080495bbba59602cb43f055f627fb06b87af90be75c27a76103ee71798463
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 22172 bytes
font_02_sfnt_off000166c7.bin
0a61f7b62d1855c687f64493392d73cd9c0bee1f266716365885c51d93475048
pdf-font-stream PDF embedded font (sfnt) at offset 0x166C7 10884 bytes