Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcda74d8dd3c072f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 19:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a179afa2c7eee8ece3560985d79900d SHA-1: 1d8d6f67e20bdffb09652fc936029d0459d6e4e1 SHA-256: fcda74d8dd3c072f9ef183d726c79fc7868be90c8345ee3ece7b7cad9b56f60d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83fa9689a---13500471341.pdf In PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/widotizutimazar.pdfIn PDF document text
    • http://dongphat.net/upload/files/75831173978.pdfIn PDF document text
    • http://ellev.fr/upload/files/ponademimameligebo.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/78771425974.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/tehrm5ieli1rm154qgrr6hr21s/nebedafojugeboleriw.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/32101538232.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b71a967e6---kisigasurusefolizoduvu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/14ed1c006d6b4e66653bb45fc51f08ae/18782169436.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/zuzolazasi.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c6f45449401ec072890bdd0d5f214a42/98353030535.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c099f2c0f---kifexodimaburis.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/dumonazuvevij.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/sirisuvapokavezazuro.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/tozidivige.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/laronumux.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/679a236c4996c17840cfac7b691f5d39/wijukonerutebegoxap.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2flq7f85o6mflaerhbf0a2ipostcrfco/78119993265.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/66264285555.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/97958945446.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/46727914991.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/89682608961.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/dosopomimi.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/viseje.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/nason.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=avon+brochure+january+2019+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 11308 bytes
SHA-256: e0ae87bf9292c720fcbb1862624bceb2e76130da968f88818d92d7bf37e226ca
font_02_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 16192 bytes
SHA-256: 5a9fda52c7797ed46463ead1578c3a843b24183ebff83611d21d90a3ade1da2a