Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d0e08fc86c8881…

MALICIOUS

PDF

90.9 KB Created: 2021-07-05 04:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19803512299757dbd2cb0288091d8429 SHA-1: 6e90c14f6247eb66392ff973037936143aa42b94 SHA-256: c7d0e08fc86c8881f70b4a3c56f61d0ad1f3a5c60c355cd86cfdcb62217bb726
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb927985c66---gafajuva.pdf
    • http://extintoresorigen.com/images/editor/23968719855.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762041b317e---manozolulow.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082fad06585c---74646058361.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16209658995244.pdf
    • https://aulacvn.com/upload/fck/file/panivuza.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a151f35b232---zudizemuvesofisixepov.pdf
    • https://imagebeaute.fr/userfiles/file/dovuputafodufabuxag.pdf
    • http://sns-russia.ru/userfiles/file/viripodonerujel.pdf
    • http://uleshuzatshop.hu/files/file/71732275934.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608317543de26---39590161446.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5cebffbf---1850148549.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2a8ea5a040323097803a792534437ea/lemapujiborujuzemumone.pdf
    • http://agro-vostok.ru/userfiles/file/ligajibalijisatukovosojis.pdf
    • http://capmar.eu/userfiles/file/betadudegasatem.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/adc054d14f2f7195eae355c53701e1db/78023217250.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/11347531353.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd717e8a6f---31081144514.pdf
    • http://muaah.ca/userfiles/files/nuninepit.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089a6cc70612---61488466215.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2157168620694639955800ebe92738ee/xawefefesatemejekaf.pdf
    • http://backkwang.com/userData/board/file/67531469006.pdf
    • http://riversedgefm.com/files/file/sisajif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ford+fusion+manual+transmission
    • 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_off00010015.bin
a43296a65e7e3a932164a3d884a48a7db97993d3ec371f69083074b1fad42a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 10460 bytes
font_01_sfnt_off000117b6.bin
23af5c5084f7798f56287c2ce72a9c4cc58fa4e5dec5c9fe4d0e6a759256c676
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 17616 bytes
font_02_sfnt_off00014644.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14644 16792 bytes