Malicious PDF — malware analysis report

Static analysis result for SHA-256 d427b23d10015328…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 12:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8fe768203ae38445f2bb8af60b2c56a SHA-1: af75f68b7dbd60283ce88b36c27ec66cea96dc74 SHA-256: d427b23d10015328414b5a2ff97880166e6a063cb22d7734b6a6072f785fa7c8
156 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. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites, likely intended to lure users to malicious content or phishing sites. The file's structure and embedded links suggest it is part of a phishing campaign, possibly delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828e41a1e5---robavexofos.pdf In PDF document text
    • http://kwong-cheong.com/userfiles/fetefuju.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4e2eadb8674bab959973f5c71a332520/75840368243.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/63584648817.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/67600372724.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/79fcc0dc80a346bbe34f048c35d4eb96/52646074766.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/fozoxazugisapewiw.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/tunemiv.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/38392387312.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/30838240100.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/53748690054.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d401403f0b8a90df3a83e651c4e88a23/10110267839.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/def697700999ac3fc4856fc012d90895/2094275117.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f797596efc10630e5f16803794591c76/76902815224.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/981eb105b6bf2ed23190ab2ba07d27b3/wisukenifatalezitu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/xafapapijapagujovede.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pafuremejipafafo.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e8f921ff9c4668e1938dbd7404410149/211965978.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2p4d7g7djmuu9aljvausvj4bsq/83506093344.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48cb105cb---75562524917.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/18342630151.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2f7703caea1d87809e4b0bccff33fde3/nidugutiju.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/23131785697.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jewet.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/u3so7fe7urbsgj3c75q8jh2sb4/tewugojadekuriful.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/lopejitowirudawow.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1ce73f4068708bbcfad7fadc8b9268a7/rafet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=inflection+meaning+in+englishPDF 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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 17264 bytes
SHA-256: 9f7a3547b39c4a797a3ba6fbf67cad4bad04823e2b4cdf375c9038fc4be141da
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 10636 bytes
SHA-256: 42328b52be66a46a8ce57627c0232483387c8548fe89167bb5a28d35fa7ae7b2
font_02_sfnt_off000134c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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