Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fdb9484759c5d3…

MALICIOUS

PDF

82.8 KB Created: 2021-06-25 20:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b2e4d559dbd5951e44fdb79631b4454 SHA-1: d41bc919bd66de3a3169278f58339d6a42ac9fa7 SHA-256: 41fdb9484759c5d39477233112c00d092b34c52677b27bc815ec87d3d3d857c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nomylo.ru/uplcv?utm_term=sims+4+sexy+male+cc
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/695965e568eccddbd258bf88223bc90f/vusoleludono.pdf
    • http://aaaexpressac.com/userfiles/file/bufafubozewuzo.pdf
    • http://akinmedikal.com/uploads/file/98756783372.pdf
    • http://pillshop.ru/uimg/files/66388459899.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bb9dcee61---pilazoke.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02eb502900---93861150573.pdf
    • http://infinivideo.hu/sites/infinivideo/files/45001564924.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/3496156918.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ke70e9hjhkg7ohvgral0ba2s28/92267564405.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a63db605---79364483101.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/htjr5s0tu4ocdv88db5oi3aedc/95276828014.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ce903dd71---migifekomekonevotug.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab65be2202---42786090447.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5b71694f2970086a298a82311a3feb4c/77958596208.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d878.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 1700 bytes
font_01_sfnt_off0000e090.bin
ef9c013d4b069fafc1a84c413bbb65775a58bface8069f75d4f46de6c2b87ec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 10336 bytes
font_02_sfnt_off0000f7f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 16792 bytes
font_03_sfnt_off00011002.bin
c6b82d5bfc1273ff178db6c24cc6ef1ff46c3b8ff7e100fff593795ec698b7bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 17596 bytes

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