Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae9b68720fe1514…

MALICIOUS

PDF

85.8 KB Created: 2021-08-18 21:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba4dbcd2286d1e37eccc0b0ce732d1af SHA-1: d311f20a44b26db778a8d5487a4f4134f562907b SHA-256: fae9b68720fe1514549c79b50d2170c965563217692086176b98973683d2c7dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=laboratory+report+8+epithelial+tissues+answer+key PDF link annotation
    • https://dm288.com/slicice/file/rofupim.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/tadokawegalanoxavu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd6c29e16---nomolaronoxulefizasegurap.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/29595cef7a2e196c412c7ec2fbc43e2a/52801353531.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/wakujelipotigos.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/dovobobebuf.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c578063ff---lafonubasinaberaberizuvi.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/risimajipaluruzusawuv.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0cs8v8c8rjkeu82f7iujpeb880/60039586151.pdfIn PDF document text
    • http://citra.cl/userfiles/file/gizoxuk.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/mojatagufonexe.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/sopifakejib.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/jimizuvoxurilovorezejuruf.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b4caafda2---15746607366.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096399f0177f---xasugoruzilome.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/xifemupadipitofofujuxow.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a2cd0b80---73592523227.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/9804308328.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16105ab9626f9f---vovaxenemalegaze.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161092a8b19941---wixuxutumezaxiv.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095fdf354658---75518092570.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997c8f23218---wibijekalufukesawegij.pdfIn PDF document text
    • 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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16796 bytes
SHA-256: dec8fe78b642498c7c33e34ccedd2a8a3861bb064fe144ff8d6b28ce28ad7e5d
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 11048 bytes
SHA-256: 356d149d947b44497298c57b4e38c3731626f885cef1776ca275da072e1dfc52
font_02_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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