Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2f11f78ea34ab…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 05:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7698da91ca7ea6cba72d3f44a5fb69a4 SHA-1: a84fbd68288b57ed0edb77da6f0d725f6efc588a SHA-256: a4c2f11f78ea34abd93d9703b3e773ebf32676952134b033656c4a9fb48da64a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics supports this conclusion.

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 https://drafthe.ru/uplcv?utm_term=site+for+downloading+ppsspp+games PDF link annotation
    • https://castilloexterior.net/ckfinder/userfiles/files/26862241040.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/84908286036.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/vunokuzusajifinizowo.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/76266056828.pdfIn PDF document text
    • http://erictex.com/ufiles/files/duwimeg.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136506dd2ab0---31734798235.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417ac397c3d---26982615989.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/36751943854.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/34831123e84ba4d8668369c22d5c8dff/71586214972.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/58265283316.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/63152793401.pdfIn PDF document text
    • https://susta.vn/userfiles/file/7909039545.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/93670484742.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/sobanunepop.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/48270775560.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ef021429838c219a184f1d1975c20a6f/nabuzasaxujowulotitulilu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/nojunewasotej.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/16800990967.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/98597963067.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/71247608976.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-9/20210909020602620442.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/vanagigoluwebosugiruxol.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/57193734510.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nemav.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_off0000bf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 11004 bytes
SHA-256: 248b7c3d82ef06d6b82dd41596446bc1870bd5faa9f33116f9c1fe2c79c53e9a
font_02_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16464 bytes
SHA-256: ab0c30bad9fc41562fb2c76709ad41ce61a1c665190cbf53e405414ce38f20cc

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