Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd07723954fed26d…

MALICIOUS

PDF

85.4 KB Created: 2021-08-13 13:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbdc7a4bfaf73ddc5e181ff52a031141 SHA-1: a5811164124b7286f239e7a89ffdf6ec2dea72cc SHA-256: fd07723954fed26dd04ffd4758631ea39a40dc9a5a02e8d42b6dc000f2627240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farm heuristics, indicating a likely attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing or malware distribution. Although no scripts were extracted, the presence of multiple compromised CMS upload links and disposable hosting points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=how+to+record+revenue+journal+entry PDF link annotation
    • http://anhuizhkj.com/upload_fck/file/2021-7-21/20210721200759785564.pdfIn PDF document text
    • https://airshow-bg.com/file/10781349071.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/80466702048.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tibunigizugukeg.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da204849109---jixunewasalugiguwevejaxid.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608568922464a---lekogupuk.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608827f42b755---xubesusikojituxuse.pdfIn PDF document text
    • https://schmitz.cz/res/file/topagukob.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7d11a5895784ebf6fa105b20677bc9aa/43597643088.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5789fe412dc8153aa00e5fe47ed41e0f/73240733063.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/fexuzinawajak.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/90f41e80f665b5cb9bc2c4558a74ab56/bagemafok.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609981f8bc10e---lilupegoxebifakosoten.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/52221378436.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/pawuxopavosap.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/347ee392d44df1b0c6ced8b4da975523/20369845777.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/nivip.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/66942299287e2ffbef2ad9dfb2e210e9/68836146032.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/765146cfbe3bc65cbea326bef0592ec4/xapejojodi.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/jepudoduxipugusomiduje.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/dalij.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/eaa66131d7508f293e3212bf3dc666e9/gapaw.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/702a99ee7f5e3d4ecc8db19851145a51/rezojafizimoriwodijatakax.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nozis.pdfIn PDF document text
    • https://curvy.tw/upload/files/27162819448.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5e6d2006d7da5dee14c748fb8eb92f17/82060999137.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_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 10588 bytes
SHA-256: 636bb3236fcde41dbc9404cab13e43de8f9edf78e32cc397debc4a0106ef1110
font_02_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 16836 bytes
SHA-256: cfb4c5d2925763359d744fee7c649c8b482a25cdce0bcd5532bdb167ed6c92c5

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