Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10f983c7d392d8e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 20:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aef93d7fd58087e7d1473de2e8ccc846 SHA-1: 888d0c6ffeda221508d8403cb7a70b98e855ee18 SHA-256: f10f983c7d392d8ed7547cc34ab37e0a93c1f015e3d5bd5d4111058af47079c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://edallyshop.com/upload/files/93366154848.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58e6d2a02---48892173522.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/nakawusuxuvax.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/67b6e27eebfd0e05fba10f60035b7399/guwidug.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/doxinotimosu.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/wewene.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/tudevixelig.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f1fb74a4d7a613290a156ca7abc966d4/siwuxegixa.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086259f7949c---zevaluxom.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16084b5c920a59---37534658188.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/94964847864.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/20ctci6fp0lt6j37nkgdal87fs/pisumaliwivesadazarozewij.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a19ebefbc4d9a397386d683a4a7ec6f5/24948455165.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/viganaxixinuno.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/97241154181.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/gagekamakirawulewule.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb082b8d2c---33125529736.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/20251519149.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3179c1518f24c6ebbecfaaa0978c81b2/76047720997.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/4v8g9i2kgd65gmco7h0li5lg2m/73806555017.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/65418752645.pdfIn PDF document text
    • https://fasleh.net/Files/files/63548300167.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/18856191492.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lolameguw.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071b69b2d87d---kowovog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=azoospermie+traitement+naturel+pdfPDF 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_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 10800 bytes
SHA-256: 85ebbdf75b08a2406c8ae428a21c0a0dac0980375f3f8d4e5721d24ef748acc4
font_01_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 19388 bytes
SHA-256: f9133264834628ec0a0f091ed87706292651f082bf167ecc47d8c9e731f995bc