Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcd4e7962660593…

MALICIOUS

PDF

82.5 KB Created: 2021-07-02 21:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f12bc64784aed42a2f8be6bf7f749c2 SHA-1: 408d6d481af12541e816a72f317f787c07b2d840 SHA-256: 5bcd4e7962660593d9ba1d11095400e64a677933e3e1549978c684b1fd8df60b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

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 http://collegium-connect.nl/ckupload/files/jorosevafugidopukupagip.pdf In PDF document text
    • https://benqmusicworkshop.com/fupload/file/83569188203.pdfIn PDF document text
    • http://allasclub.com/campannas/file/5862833923.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/82686211292.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3fe6d3db---pibukofuw.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811de5d00a9---71496096769.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/da777448bffa52fa877ceff19ea44dd7/56120987677.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/20550b70b0e03c04de3c291d7a05e46e/20041952851.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef72e416d---bemerotukuxof.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4660a549fcbf28dd45bef04291e0427b/91819150484.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/vavimutikumumotadu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2c6100186842d5c623020d1a043c24b4/57024452594.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a259a51cc---pakakawigud.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/99369855725.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/delag.pdfIn PDF document text
    • http://proxima-design.cz/files/file/69404928581.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23d662d2b6---3046405974.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2s634fclj9oika0va416iv1op2/donejudimudanerovemiwud.pdfIn PDF document text
    • http://millecolori.it/images/file/68321815819.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/govizodumovipujagogiwu.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/36295498584.pdfIn PDF document text
    • http://bakoca.hu/files/file/45979197290.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b8c159c1---69192269544.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26a195987---roninarefomotoxowa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ce72c0aa---xazus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=driver+license+manual+tennesseePDF link annotation
    • 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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 16312 bytes
SHA-256: 3822e60150c6467355b97576c73bacfd34a30abf4d1ea9b90f075a1a6b3afe7e
font_01_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 10436 bytes
SHA-256: 2f45b30b9aa37df679edbc1cf4e05775b45e6cbac4c7d350ec0a3025b01e5590

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