Malicious PDF — malware analysis report

Static analysis result for SHA-256 113d416f19ba91f7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-04 11:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 148a46e1c81a9d35c8c160149118b768 SHA-1: 11fe9fd9ed4ddac052f8cdd3a31661def8bec8fd SHA-256: 113d416f19ba91f7b4ab7ed4a8c25ff79ed01c8782fc2d13e2bff831f14e3aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275f09ab60---ponososa.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/31001783655.pdfIn PDF document text
    • http://sooclose.eu/upload/File/xupatek.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/65303863946.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/58850821924.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/vesupizivosikemefenino.pdfIn PDF document text
    • http://aps-mes.com/files/file/gajidaraxikubedelux.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/57306205314.pdfIn PDF document text
    • https://tavio.ru/files/file/91498887103.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082afc378679---kowepesakijalilupusaganaj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/42101ea84b04fa8f2411ea0b4715b898/49249201655.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/befapewofuleziresofit.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c22c720c---lujepanitexobes.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/60555731904.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607115113c2d3---zokiwowi.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/81181799308.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/51001824438.pdfIn PDF document text
    • http://web68s.com/upload/files/18943908598.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/31898312291.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63bb3b4e---vimeputisojubofeme.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/suviwabivijebim.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/67405864495.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c330236f2---70673557806.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/11441625989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+convert+photo+to+pdf+in+android+phonePDF link annotation
    • 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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 18260 bytes
SHA-256: 74a40701cba676dcb2f245ad12212f6a37a86a8b03ba47300ac6dfa07a116547
font_01_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 10644 bytes
SHA-256: 1c141e8079b90634a760683ac486e434d3ee25b1392271693abc634b9d24e5e9

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