Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b229a5142e6309…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 14:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e09bc0075d0289ba307da7db327b7ec2 SHA-1: 5ac8a77d71dccb84dc167a5c67e01e2f0c02e440 SHA-256: 66b229a5142e6309bb94ed7534b96378e5fe302e42d30bb83c07d9b0e9ad6033
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. Crucially, a 'Clipboard command execution lure' heuristic fired, indicating the document likely instructs the user to copy and paste commands into a shell, a common technique for downloading and executing secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://commonwealthsportsawards.com/userfiles/file/zodam.pdf
    • http://diegogenna.it/userfiles/files/xifixetuduliwexajodu.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374ce2463d8---logugoritogafosuzaro.pdf
    • http://luxlustry.ru/img/upload/87735032374.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/32714798696.pdf
    • http://hanstime.com/userData/board/file/88969737654.pdf
    • https://restaurant-kamkok.fr/img/Data/file/59896112814.pdf
    • http://eraldocomo.it/userfiles/files/23110867541.pdf
    • https://llbyggodesign.se/UserFiles/files/donojezatip.pdf
    • http://xutricolor.com/uploadfile/files/jakubofu.pdf
    • http://turagent007.ru/userfiles/file/porizez.pdf
    • http://a-xian-coat.com/uploads/files/202109160150078428.pdf
    • http://detaycopymatbaa.com/userfiles/file/1188273531.pdf
    • https://dobre-akce.cz/media/files/file/26322247186.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/jexodoxodupi.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jovoxuxafenomimi.pdf
    • https://xylemleads.com/userfiles/file/zajenoxajekolufupo.pdf
    • http://fobas.cz/userfiles/file/20669209670.pdf
    • https://eledigitalpr.it/allegati/file/gigepadolixivupil.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b036162f0e---vifisato.pdf
    • http://andreuma.madteam.net/ckfinder/userfiles/files/44787825969.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc5040650---17940982279.pdf
    • https://topclassgreenery.nl/images/file/raralu.pdf
    • http://unleadedcoffee.cz/soubory/mutisomonavurixe.pdf
    • https://felicityokolo.com/file/gufalepunanekaxibirarokim.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/28240666893.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+add+album+art+to+mp3+on+android
    • 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_off0000e2f1.bin
9d94c77ae8fc9b75150fad30072c96e2a5ed650e0c1ce3fc9066cd1c2c14ecf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 18412 bytes
font_01_sfnt_off0001123a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 16792 bytes
font_02_sfnt_off00012a51.bin
3204193a72896a47638880668e8e0acd1abc9098ade6fcca34ee2381255a12ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 10740 bytes