Malicious PDF — malware analysis report

Static analysis result for SHA-256 effec9819864760e…

MALICIOUS

PDF

59.7 KB Created: 2021-06-07 02:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c685f10b96b87346ecfc73552be0381 SHA-1: 13c9d00eb78fcc68190a807b3c07517c3d398070 SHA-256: effec9819864760e109f3a1ea46d4ce21864d1576928352cae255e302ce2c2fb
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body contains metadata related to its creation by wkhtmltopdf, but no direct user-facing content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://laborke.ru/uplcv?utm_term=junie+b+jones+flower+girl+summary
    • https://alianzatours.com/imagenes/file/vedoxozisuxej.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63fb4a9ef3---23670774296.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7c8a5101---76461414159.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16097f256bd107---67295087620.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b033dd8f---komatoxagurikim.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/89f8fndpmin1gqp8a3udejor2a/lirilidupizajixovoburavef.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ca3f145c---74312453949.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a32db1e7ff8---94159857220.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/acf2858d6c66668bab2b17a02cec1b0f/66697007450.pdf
    • http://progfin.pl/userfiles/file/rubebugobadula.pdf
    • https://anfauglir.com/images/file/jixaboliro.pdf
    • http://mextro.de/upload/files/nisonog.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a23330e460af891d56885b3c52fa0627/xajuxututupobuk.pdf
    • http://aire-limpio.com/img/editor/file/tusodiga.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aced843e79a---wotewuvupilupinemaxun.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/tavesokegidoxem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35b.bin
b0115ef29a9dd5fc32b29fd537a69bb4c496acef0693b08c976d26faec599847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 5288 bytes

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