Malicious PDF — malware analysis report

Static analysis result for SHA-256 f725e99f51f79947…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 18:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13682c540cdff912b975fdeaaae80c2a SHA-1: 0e7e9289f32d60b8750b8f98917e24474e8bee44 SHA-256: f725e99f51f79947c55959d8ef8c678f91006678eaf33a0f99c0f7a83b866ea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=android+camera+app+reddit PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337c4359910---weloli.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/45140697410.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/majazatum.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/66496226648.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140be188b0e5---92046713331.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/puzogow.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/27830695799.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021992123172706.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/64519790945.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/pevukivovawabow.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/momulakumomativozep.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/50411822494.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210907033215.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/10254249598.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/93287628001.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/030560c3a06fe193bee6082c1468ce5a/jebajidutijoked.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nomurovekuleruva.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/28464204810.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/buwil.pdfIn PDF document text
    • http://na3.it/misc/file/sokejisugifikojelubenubuw.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/29993034580.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lv2j07m68i44vvq0p99f5hf7f5/kusef.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d982e230a9---92389774922.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_off0000bc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 10444 bytes
SHA-256: 4e8e46b5a4e3dfa6f846358f99de5a779ca5e11dc42c88d4a41f97a18c37a9f5
font_01_sfnt_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 17892 bytes
SHA-256: 0c3b616684ab3c5ce6f59b41df18857683e3f6a1fe3a239e9a4af8679a8a17da
font_02_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1