Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c7b507f3b22e4c…

MALICIOUS

PDF

89.7 KB Created: 2021-09-03 19:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15fa5f32e9d13bd0f9e91ff05fb36f83 SHA-1: d94a8f3975107ff95cf68ae85cc62f672a494997 SHA-256: 72c7b507f3b22e4c4cdfacd302a922e553db3bc59cb11161dfede0b6d52645be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=pdf+to+word+converter+en+iyisi PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098583e12f3f---bidabogutetegemumuzorere.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7b711db679463d12cfd81a3c96263b0b/42802167065.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb71f66efc---kalunofojewifepiri.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/64736572624.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/25003138218.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/18449a3c8c8fe44d6a8fb7fb6d424b89/bobekomowagolumexato.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnmnmk0qf008sal2mmotd08rgi/43277901103.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/roliwabasefilubat.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/11502117781.pdfIn PDF document text
    • https://samowar.me/userfiles/files/jedilufevuri.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/wojusuzi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2f48cd1996e5f4ff43eb40b38e47a1ad/ritumokiluzigor.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/tunowomijor.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/63293465759.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/42228380751.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/69405113111.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/49607824346.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4921206f3---buvobojate.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/birilinemubekum.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/delulexezinigolutix.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff204edccee---repuk.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa10e1f82---napunuxo.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5e1d12debdc3ecc6bd068531f58de7d6/lalujapaxug.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/63393410120.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_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 10528 bytes
SHA-256: e9c482b0076bb6150d54a621afa13c2386706976b0652e0c6721931a21ce2299
font_01_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 21372 bytes
SHA-256: 0031c01998e4c374f24ca1efa841c337b9c6996cfa9970fd8a707f21e11945d2
font_02_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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