Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3765217a9898ed…

MALICIOUS

PDF

102.8 KB Created: 2021-06-29 14:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55f2f2c3be47c2b4aede494bd4f90893 SHA-1: 315f125e5864031942b61d5e6b43291524f9f7c7 SHA-256: cb3765217a9898ed6a3d86d51509baa8789787f2233c9d9e03ae599e9a583c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/58de0804801dd07dcb0ca5c623566330/gogazetetutegusovuwid.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/09162d4d6f4e477ac56cc70f9b1e0ae6/21851413049.pdf
    • https://atl-50.com/files/file/38192764237.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/81441662750.pdf
    • https://dbjadow.pl/attachments/file/nurevelegexawowumotajut.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7daa23db---dabijopujesupilovigomev.pdf
    • http://nesthomes.in/userfiles/file/15555184808.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072b973cf9e4---kaxudulibematira.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9e0d1d0c---bekavazimawusok.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b86f4a58eec255253734bfedf2a40fb2/furapetuwuxuzageziza.pdf
    • http://cortabellanews.com/userimages/jinovutesewop.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b1463874---fepuwumepopotu.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f035b5f6cc---pojelisaxurozoku.pdf
    • http://uk-finansist.ru/userfiles/file/34662693221.pdf
    • https://idd.no/ckfinder/userfiles/files/tufezobasigawuwirasax.pdf
    • https://dienlanhhonganh.com/images/pic/file/wurumadotogunujibamezixar.pdf
    • https://marosme.ro/hirek/file/jesomugamufelas.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9928d59bb---jujibozeweditepo.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/35aedd7eabc071d536654f99fd72fc04/josola.pdf
    • http://nappsa.org/userfiles/file/40120696459.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8da38565c---fepinosiwefiv.pdf
    • http://fujiya-la.com/uploads/files/sunikizap.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb5947775b---20337529516.pdf
    • https://accuratesearch.com/userfiles/file/bobodije.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+lead+sheets+for+worship+songs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 16792 bytes
font_01_sfnt_off00014577.bin
70a7a3b96a84d24f51c612c81668b824a71c2bd30d2c83e2c8f6597c67948830
pdf-font-stream PDF embedded font (sfnt) at offset 0x14577 18080 bytes
font_02_sfnt_off00017508.bin
b2cfae0e60573fddf34043282db7aeee467784fbae31224b3ab65406a635f206
pdf-font-stream PDF embedded font (sfnt) at offset 0x17508 10840 bytes