Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bedab0971df6f89…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 04:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb5292b6a01eb84570c9e8d88d564cd7 SHA-1: 03366cc5b73d68f2f4e70e91b1e4582e3b3f17d8 SHA-256: 0bedab0971df6f8989ecf3b4c7c972597ac7bff967910d3fa2b5a95c21905b58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to phishing or malware distribution pages. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a28c2c4d85e0ea9200e7a243bf000a9/5581296469.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/91271886327.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/778f2ab3cd962d6c348ede54f372fa8c/56414868264.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gnne2gcf3u2lcms4r3nlqou841/63302636597.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/30110716732.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/zasoduxufesonafopo.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/jigijo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/bululazu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841f4a7d550---foloju.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079958e79f76---25272640219.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2761409877---24357567854.pdfIn PDF document text
    • http://changdahk.com/upload/tokatewudufamir.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e066e855f9---tinukiv.pdfIn PDF document text
    • https://nadamasristorante.it/file/powopadibakodonelixovusuv.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/rodozexemajonopazu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/73d71d209b57e91cab94440fac61105a/rimejejorodukog.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f1456efb---39656461865.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c776c0c27---74494877858.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092868cb9b7a---xejibavewaf.pdfIn PDF document text
    • http://vtaky.sk/media/file/78949775480.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/38085335806.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/nodedonajunomuwigeka.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fe5bdf35---34854662122.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/cj3u9ni1las5jf8g8jslak49an/56557650279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wordscapes+answers+level+155PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 16660 bytes
SHA-256: cbcf34fcb5f4e4dd33f232a89ea6a36e8e56691ee5b32cb8b57b7682ea59231b
font_01_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 10648 bytes
SHA-256: e9e35746a1e5722ced4653bd58a70a72e71fd767c74eddab0ba615d4b6bd9292
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_03_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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