Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0c2183e6e5cf7…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 08:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e7f2076230e056fc94cfb14143f0a8e SHA-1: 5c9b4420992e538162b0ef3518f7b7456ec3f100 SHA-256: cdf0c2183e6e5cf72d6656fdd4ba9af513f6eb18f3cb036d64e0ec6a00995b74
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ClamAV detection and heuristic firings indicate this PDF is designed to lead users to malicious content, likely for phishing or to download further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier clean score 0.2255

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://sgo-bage.com/public/files/files/55021876636.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/94025474478.pdf
    • http://chothuexehochiminh.com/userfiles/file/moxub.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/053970fe5831b86de8a0ec87f08a9620/72643050623.pdf
    • http://sfera-vlad.ru/img/file/23784674896.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/74848035654.pdf
    • https://tonwen.org/userfiles/file/12000939588.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bee7f612584---nekididurefatugetuva.pdf
    • http://csc0351.com/userfiles/file/20210624044528_07ggte.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/kamebozebowamok.pdf
    • http://vivo-mebel.ru/upload/file/vogavit.pdf
    • http://unipsyclinic.com/userfiles/file/20210511133835.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/fe3a98a9f6d14193fde3b561c93eabad/93094677248.pdf
    • http://mppscstudy.com/admin/usercontent/file/seramibox.pdf
    • http://tznjl.com/userfiles/files/12773865919.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jfbfimkrrbsg2ng5v5sg4i0hm9/63086197095.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/td1lr4jp9h4d5o6g17odigg2qc/xifexazirapale.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gj90hbik1k3msuik6lbnsir5td/42525348959.pdf
    • http://charmingcurls.se/upload/file/vuzuvi.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/relikakap.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc945fd72---vafinuzegukip.pdf
    • http://szpitalstrzelin.pl/userfiles/files/kizemojetujivedoz.pdf
    • http://scuderia512.com/js/upload/files/64758206860.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111d1ce31ee3---33941197916.pdf
    • https://kurek-rowery.pl/user_pict/file/gumaxevowofo.pdf
    • http://jarosi.hu/files/file/livenabuso.pdf
    • http://canyonoaksmtg.com/~du
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+statement+of+cash+flows+is+prepared+from+all+of+the+following+except
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf4.bin
00e40e7e5657489e5bc7cf4a693dd886e2f39b5de68d1abc48e2083941c7cf44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 16032 bytes
font_01_sfnt_off00010529.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 16792 bytes

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