Malicious PDF — malware analysis report

Static analysis result for SHA-256 328e7418290b8eeb…

MALICIOUS

PDF

82.7 KB Created: 2021-06-20 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 24ca29de11476d397849c601cf13d80b SHA-1: d23b77de3fad65f843ca51481dc807a225e740ac SHA-256: 328e7418290b8eeb26efcaf2da2a832f6cf26ae14b25d5fe16d4cff721e657d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8ej6j51bsmejbt52e0pjqam7bn/79224319647.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8rdq20u5de8ppklk7ceuj64is5/xexabir.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ad44dc29---zifuvejarusudemegov.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/ziwekunavopivimur.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/49463402919.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/17ec50b17f2a35af348775c3df004bcd/nudalalavajizub.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cae20a20c6d---37207507299.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/furafebo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6218bbf3---najirisura.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/roneze.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a2cd9e9e1625dbdb58173cc6f8b6be6f/lipomumitiga.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/zugixoxufemu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607081c1a14cf---lajibosufesiwinux.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/dkn8uo0bml7b5e2bsaj79tibkh/gazama.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3c13ecdb9f780bd6d79aa4dfd5308be/25015359535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lower+division+clerk+question+paper+pdfPDF 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://scripts.sil.org/OFLIn 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_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 5432 bytes
SHA-256: 55aeff0c39361c4bdb8127035092b976afddf6bd8909bb94d4dd69019f54fa3f
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 11660 bytes
SHA-256: a9d3d16ba9dd98e4a7fa581582e31e73cd3ef164239355e731f484ae001a277d
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67