Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff69497d7bfdbd31…

MALICIOUS

PDF

70.1 KB Created: 2021-07-06 10:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 82378b0ecfdca3d3d3709bf947df0856 SHA-1: 6eb0a64e46105aa39c15ad0b48e648352d915d2c SHA-256: ff69497d7bfdbd31a37ce98a2909b3c75f56d2825004622991557910a8dc9c98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests an attempt to obscure the true malicious destination or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cpspcb.com/uploads/files/28772505388.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608514d8b40be---nifepi.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/didanegitidu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a817305afe7---71294843707.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c409486a2---jujizefewogusulimule.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xonuxokizapewan.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/25105df5a751c6265491af133ec2aff7/43285115395.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4eb28ff43---11554117913.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1eaaf1068---bijozalabuniv.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/47403187279.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b03269eb8---97804209715.pdfIn PDF document text
    • http://terminsk.by/pics/files/60008335277.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d0614c2130a---5021837449.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/10713447452.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078295f97388---denovapovef.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/33856144393.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/2391889742.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/de4996cb5cb71d72843dda67b2ee3f09/38329225260.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef03c376a---73276708848.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/tevelifiwiwugotopipunotu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/setajibijododijulo.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/fscdnjf0pmb5di933qhmbr9qd2/zedufoguvenofibuvi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6124550346---ginuka.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/20601897112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=json+minify+to+normalPDF 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_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 10348 bytes
SHA-256: 55456af04600b074833410d35f1ae008a26295a5265ff27f3d1c04a2267de8a4
font_02_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 15592 bytes
SHA-256: 8844440fe81402bf061579856f7524f99a25deafcae328be5c773a5673fcbd23

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