Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a6bbb17b9c9764…

MALICIOUS

PDF

80.6 KB Created: 2021-08-21 10:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaa7c69bd0503a1a966bcc64d49ab220 SHA-1: ffc400307d02c673e081e692cdd9bff36cca007e SHA-256: 66a6bbb17b9c97648e36a0b9818210bcf274b80e8d12a6cd578934cfa4cddbb6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack vector appears to be users being tricked into clicking these links, leading to potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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 http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3e3b9c69---kabojajijupovomakuzimit.pdf
    • http://imaginove.eu/data/Files/diwefore.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5b764f7c---63413621454.pdf
    • http://ballarioarchitetti.eu/userfiles/files/81019099533.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3555e78909---nalafutowukek.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/56791ed4228f4e1cb702af5f877bd758/dimudexu.pdf
    • http://rococosofa.com/files/files/gakasavipakasidiza.pdf
    • http://ekhoron21.mn/uploads/files/bubavisujoxilopunibobavob.pdf
    • http://solac.nl/app/webroot/files/userfiles/files/78482073827.pdf
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/detamo.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b2d10d3526704705de02f05ce9518fec/vakabugibadixafu.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/sasoze.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/09cfa70eee550dc8de941de73b1c0f46/10883904701.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e6364c3867c97aa68bb85fcd63730b33/48000769576.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bizejizoxujokokemex.pdf
    • http://webatnet.de/ckfinder/userfiles/files/kedobemolak.pdf
    • https://al-farh-iq.com/upload/userfiles/file/verobuwutifaruwamanon.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62ec3c9aa---76267919179.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/22011c7312ea8bca2577b25ad08ca843/86747732712.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/lelefaniwededijexapo.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092745e8d221---21685936424.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/begikafe.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608394ff30341---12514078878.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/76a276d1388fba112e02d85f03c128b3/24612949086.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=antrenmanlarla+geometri+2+%C3%A7%C3%B6z%C3%BCmleri+pdf
    • 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_off0000d2b5.bin
0002e48007d2038a002f52b4ba92b439f76435fbae16610a67b2d2a2d36530e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 18264 bytes
font_01_sfnt_off0000ff07.bin
fcb997208bf1282fedf3891036edff0fba241d55a82eb3df908655377d4c16e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 11436 bytes
font_02_sfnt_off00011959.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 16792 bytes