Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fe857fa865f750…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 15:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d22a432e9ef074750697850db3414627 SHA-1: 2f102f18b62731b6eb5fe3097f7d68444fe62806 SHA-256: e0fe857fa865f750d24706456310fa874c0f887360e37e1b04b9a93cd0eca1e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to obscure the true destination. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely used as a lure to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://okwmd.com/upload/fckeditor/file/lugikefu.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f9d935adb---5161100490.pdf
    • http://sportsgarten.com/editorData/file/jaseluk.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb53c02b5---bekawulunakofulotupotim.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c920ce2ae7632f01df47aee371c1efc3/25222512115.pdf
    • http://inlovehuahin.com/file_media/file_image/file/62095079849.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/83d5a92ff0638d0adad34c7afc0b1028/sakamegewutanonogixudipup.pdf
    • http://modnyi-buket.ru/uploads/files/xigiduxodamud.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f6c6a898c9622d04732ebcf67ddbcc53/47250452054.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a75063656---72758610579.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d760a26e0c---kaxinideloduboruki.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e1cde1b12b683ffb77188353935e76b1/42149276314.pdf
    • http://watsonwilliamsreunion.com/clients/82103/File/voxomasiwadinufiweja.pdf
    • http://ongxoanhdpe.vn/upload/files/81077050033.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/vufalobuke.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35940ea1a---55670292562.pdf
    • https://amursvoidom.ru/media/files/jatedubafonuzodikoti.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b1dda1772---xebaguwos.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4dee919---lalalumonafolifudoxi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160789efc3375b---pojasalazadefonazaxov.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/gudigi.pdf
    • https://ascinfratech.com/clientprojects/trading/file/zolutotezexidugev.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/79359905458.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e427aeb9b4bb882e90bf68dd20d79238/83488079499.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/72487859254.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mixing+brown+and+black+makes+what+color
    • 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_off0000fd2a.bin
b0ffbb8acfc4179c51fae998c51fa20c1960f5800d3bdc42ec5312a862ccd56c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 16516 bytes
font_01_sfnt_off00012824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 16792 bytes
font_02_sfnt_off0001403b.bin
6c66a6ad902a2fb804e44ef9d320a7b751e5fdc28ed2cda31ac2fd5ea255a535
pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 11228 bytes