Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a17110087ea0114…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 23:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7e00699658a93f07fe6bed207cb02a58 SHA-1: 26064bb8791c2b9ed6cf589736f74e42267af73d SHA-256: 0a17110087ea0114c6bb0a35ba4279c577a420885adef95ba01fbe3964ad9825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://dutchfansitenetwork.nl/ckfinder/userfiles/files/bizonigu.pdf In PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/6a4ec1a4a5c40410560d36776631ab13/45820374393.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/81251931688.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d2fb0dd23835f242d80b8bb1e60bda7a/76418093374.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/74350792625.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/rudumivup.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096819175ef4---nibojisekaviwobefeja.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/a632d1f6b5258a5e539c1ad2af562a83/pitija.pdfIn PDF document text
    • https://norservis.cz/files/files/37427457173.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854e5fd5f04---wakireximemo.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607deef2448b3---12604840249.pdfIn PDF document text
    • http://aplus.to/userfiles/file/22168132837.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080cac596dc2---32459697293.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833b208c27---pavalefokoxafebogisol.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ed67c7a---gezepopanag.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/58294991253.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/57839177381.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/kegez.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210508082321.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/658b5097f68dd96346b370345cfccff4/65261137282.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4872f9fe9b---67047707443.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bac10eb0d5370f7201a5aee3523507c9/wopijurepurodazezi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6jh6u6q755sacl9hrqcbit4555/44190354606.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210518215349.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/vilowinuje.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/48287012547.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/aoc6o3drb949ej71ibhdiau0c1/vavinezowiregubusagedana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=failed+to+detect+location+pokemon+go+spoofPDF 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_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 17060 bytes
SHA-256: 8f20940a4413f9291e12bdf27a57d593786e7488ac99d0b0e23b4488f7e4ae43
font_02_sfnt_off00013cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF2 10932 bytes
SHA-256: 0595f69c19f5948fea7616bb78711c92caeabc15d7de3a3959a014c5e802a125