Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a1e404caba21c4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 04:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c4613203ead325ab516a38e1132c09f SHA-1: d1da557dab6223233b57376a04dc888adaa4ca96 SHA-256: 92a1e404caba21c4f9a0395cab813ef4269efc0d317442beab9713c3d086579e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, some pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bsa-billiard.by/images_from_html_editor/file/ponadevodo.pdf
    • http://sinching.com/uploadpic/files/202108202024056219.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee7b91c52---48487741212.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/84f90da5458b68faad3e3b3833a1fbad/82910079320.pdf
    • http://er-trans.com/img/produkty/files/dabitutowodelegazu.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/90f98ecb9a6d3b40b68466d18a0ed5d0/pamasexarerejopeva.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/17854e1fdba0be5f2cddcb59b17c2a7b/fonarewefeziperukaso.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/60495959959.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/65a84d2fae332a91c1b8570906156658/80405329151.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8749c37248---60712584513.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c70e83076---70346553301.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/29130553945.pdf
    • https://hogies.com/includes/template/uploads/file/66726026097.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/31306839752.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/53q2ffnmm72jep9dai2t8abduo/3164996625.pdf
    • http://studiopetrilli.it/userfiles/files/zutekirizusuvi.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s1ahn2vnp524b87fmr9n4jl35h/72228376545.pdf
    • http://caramelitos.sk/files/78369585214.pdf
    • https://bandai-k.com/userfiles/file/mezujamomojagomak.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b87caaace---99713907328.pdf
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/33209162315.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71c49cb97---zenamumun.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c96ea5ee093d1a9bc2e4375fa6e54501/5074322882.pdf
    • https://langestrand.se/anvandarbilder/204/files/74045359398.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9782dac624---taravilezuratekasadevu.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/vewojaxopegaxuwapisogo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nagaland+university+result+2019+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c708.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 16792 bytes
font_01_sfnt_off0000df1f.bin
5cb3923620dbc25b1950597bf2944fcfdfd45bb99924a116bb84dd818de04a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 11272 bytes
font_02_sfnt_off0000f9a2.bin
adf5019862d576c2fa70b6980f7c407ce4fb030c95a799ecca806882a42a779d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 18896 bytes