Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ec0b3203086cbe…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 13:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee2193656304cd005cf272e28fbf3351 SHA-1: c277630eff93d100e362bd89b349b549a77359e3 SHA-256: 11ec0b3203086cbe8cca57895ada08068a16710c282c47ed33a4e9dd6e6c03fd
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also features a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7814

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.
  • 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://smenergy.kr/uploaded/file/22001720860ffc854296a3.pdf In PDF document text
    • http://xnucleus.com/members//member_images/files/tobizevosajetif.pdfIn PDF document text
    • http://xsteelstock.com/d/files/99577523173.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/vomunijuwerobafokikiv.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/puluvagemulu.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/55120181220.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zaluxafetiwapepuzawip.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079539eb4abb---14924654368.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608896e0e171d---menodexun.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/98u7ua2bf75k0hls8k7t5mdf91/47649055781.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/bogib.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf689a92f---19520200275.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4964709967---8310534999.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/bikifizulumez.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/61699504012.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/17bcbfeb7cc13160a66ba060fc8204dc/rominodi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e4efcf4630e4d7492eaf6be7e6e22148/57549524071.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be8d59b97---37686572425.pdfIn PDF document text
    • https://vzglavniki.net/data/file/29597799650.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160725701d7164---nesiworevesatabiluxux.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/36172501871.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/vipiwamobobutuxerovubo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080040eec111---69666465803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=product+marketing+interview+questions+and+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 11160 bytes
SHA-256: fd1fc7d29a38cb76f6c0d8e167269c647c638dfb67b8ea1494d902496758f082
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 17452 bytes
SHA-256: bc5bb723ff5d9641caa6b691fd4c21d2ac23dada20a72996e3793ffd4ff7ceaa