Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b5b734a96b2959…

MALICIOUS

PDF

131.5 KB Created: 2021-07-06 21:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ebd765e41ac0951a85d9f2bdfad916b5 SHA-1: ef3778eb292f39bfddaff78daff3b2806fa4f3e9 SHA-256: f8b5b734a96b29590047affde0ab1341c1ea031651e7859fb46866c433d7883f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing or trojan delivery mechanism. The presence of numerous links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/672fb3c0fe007b1981c8f7a243dd23af/miverimefopewetofigi.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095d62d51400---kazomuluwixexevadefevujo.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/18679066211.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3fe9e81fbfa4b1b7efd3f9f34e9fcc2a/73446749617.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fa4a31d71---najijejevofab.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2189da3151d135ec670a780894a81828/31142826254.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/76506265528.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/948f98c8e5b8e23c9c294a1c4263ae62/15380621677.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/nlqlg2k40tbbhela9faqk4kt97/83747358841.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fdbd8a249e707a001e78914945112f11/70203254206.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/6449392110.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/64945638320.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/10357305781.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28d912ed1---tikasojejuwofibataxu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibaqpusibpb32luhkug3e4gah0/61630321469.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/peniba.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/0918f7be5e51e49167cc7a0fbed9ff61/71292920415.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/lo3qu7p6ahesuvau2densvjk87/75485779952.pdfIn PDF document text
    • https://webmenuplus.com/images/file/84797138103.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ohlr682jtm2tgqvig7d00e23q7/78813456879.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2206c67e3---wuloliritiwer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+the+fate+of+the+furious+8PDF 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_off0001a01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A01C 18108 bytes
SHA-256: 55f01c73d3d9aac48647b9cba48539a81e142fe09b531922b951c04c15134c47
font_01_sfnt_off0001cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFA3 10848 bytes
SHA-256: 43ba8fee0b595de00b9e4c25376b2c8dea86de45450a9899a3f08051c7020a5f
font_02_sfnt_off0001e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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