Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd39f1afe47f07f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 07:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: deb3b0198f3c87e3fa2585305e89ae91 SHA-1: 61d1926db21f0eded5c76c44fe0a4f5c0d9ba5c1 SHA-256: 0fd39f1afe47f07fbc0699c698b8ff0457bce039cdecfd81f0d61b489878ead7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. Heuristics indicate that these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=porter+1985+competitive+advantage+pdf PDF link annotation
    • http://brezov-gaj.si/uporabnik/file/67159510758.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/39409546489.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/40194175200.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gukakivekirupunufegosinod.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/pajutat.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/85910796033.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dbeg8s2go970jv3ikfut7gi3j0/75531147699.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/99339158048.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/74826738579.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/86812437782.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/69549884050.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/nomogusedidi.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/1589372014.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/renobakepebobig.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2e69e2e9b6a2aaf94dc00f6e37cf873b/zisuferizegoloko.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161337195148d1---7754252470.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/xujewuna.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/zigegavugokaxuxubidijum.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/72018043203.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/samigalalirupalasikase.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_off0000b5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AA 11376 bytes
SHA-256: 5a885883cbc09097398a8b8be4772009f47354f82ae78715c4a2fef7f195b37f
font_01_sfnt_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 16432 bytes
SHA-256: 92909d0d45d71e845a384d8746e5ae169318737d0478d0759733b76536428cb7