Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f071ef15f83579…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 19:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e35131df483fdd173f4d35c392304833 SHA-1: 62e3a702ccd52775a30d8598cebadc54f3f57a9a SHA-256: b4f071ef15f8357971c68c3b9aecff0d5680f8ce5865926d79bfb95dbf4f73e8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of external URI heuristics and the compromised CMS upload link farm strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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://pixomot.ru/uplcv?utm_term=mental+disorders+pdf PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b696688d2---bufurofokawumowa.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/75938592681.pdfIn PDF document text
    • https://dm288.rs/slicice/file/53079390434.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133895c379ab---88234589875.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/36190874779.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078afef3f597---75037973136.pdfIn PDF document text
    • https://codecs.roimages/file/xapapuvi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rgru5gt6iek8sr54797ijenom0/jazuzopasatonilenom.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/batorinupedidobiva.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/o6ah4sednavioebcvgs0qdcpc3/18208627797.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/f2f33f088a8892a915e0eab526cebeb7/39375705364.pdfIn PDF document text
    • http://feg.vn/uploads/files/45587287120.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5e9016d1af59951fae9f90bee6acbc8/vosuto.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/71bed565a2d7adb61d99eb05d9e00839/60718340858.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/31961768271.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/defakures.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/zopozunutakipe.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/17011732991.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/86235937672.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/xesuxebexila.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d9366d82d---dasenifexalajuserol.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-11/20210811231912323719.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/49039492627.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/jogudiniz.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 17352 bytes
SHA-256: 8f329cac7f18cb2fde51a35d83ea91b69514c8dec57568dd3080ab70b86d89ee

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