Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eb925935336472…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 06:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5fa5b6d7ad6a4e6ca4f33b64b0cfcb3 SHA-1: c8136823ab3936e1716d7dcc7779c435eba628ed SHA-256: 16eb9259353364724e5106d4935f18b27b3be751630a6a5fc5d9083f39aedb3c
156 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 phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely to host malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure itself is used to facilitate the distribution of links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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
  • 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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d76bcdcd3---83019542590.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf612ccc7b7---3573879708.pdf
    • http://bassbasement.org/userfiles/file/bekutalirujupoduzam.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cea4cbcfd5cc79435a47079b1db1ab6c/zunumabegixupudunagax.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b2270fbd02a4c8df5430cf5c946ecbd7/50211450396.pdf
    • https://semangkabiji.com/contents//files/jaxitul.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073c36e95303---betaxuligujutupa.pdf
    • https://lysgaards.com/ckfinder/userfiles/files/mupekepowobali.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a040ec140ec---diwisudewagabab.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d43041149b5---rikijuzomax.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c46d78aff42---tezesuwibigaxajovexomu.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/nifepojebevilagare.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f878fd5ede---lotexuzuzofef.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725eb733443---24793062211.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816788f1003---jizimujevefejefibureme.pdf
    • https://majubesar.com/contents//files/titotedovidizup.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210627_19C38C77B9089723.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b4c32e0cb287d53b01d7c56021bd89e7/74154495530.pdf
    • https://fonixkoncert.hu/upload/file/bokopumikajajokeriteko.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7acb3ioilk549e1l43oabmhikk/welupeziremowanufun.pdf
    • http://nadiadsa.org/userfiles/file/lutafapinuful.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64e058794---rokemelisesidadogitugi.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a14eeae8adde691ac1b12e9b90e72e17/63941249802.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160832f7a5bcf0---rebiwuxeredaguned.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c8755040961fc1d1306434e370ce46ad/63457843665.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tanenbaum+distributed+system
    • 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_off0001068b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16792 bytes
font_01_sfnt_off00011e9d.bin
45b2c6afa3115c153d9b3160c681872b6e11c02d1b27e99139e89500850b8718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 18840 bytes
font_02_sfnt_off00014c97.bin
4374c6b1c0ad7f11031e8654e948d3701ed1e174e28caaf5c458f73152abcee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C97 10560 bytes

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