Malicious PDF — malware analysis report

Static analysis result for SHA-256 d676a8d49c3cde54…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 20:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40423dcc4762a9282f16dd90ed4091d2 SHA-1: 234adf365e3bff0b58fa23dbc7e816b7580d8b6c SHA-256: d676a8d49c3cde54010016c7e1f690efe8fec0a3ebdec9e649a8475ae0159700
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://elencostruzioni.it/userfiles/files/98865908154.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161321d32e4e79---pobesotujekamaga.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zewulatuvew.pdfIn PDF document text
    • http://drironcat.com/images/file/23959238046.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/zamagelufaretuxaselevab.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/89289433800.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/vopigefazaxaloxakopepo.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/dusowomixoda.pdfIn PDF document text
    • http://xprchemical.com/upload/files/76977174668.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109040718334082.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/71176280800.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/41208355389.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210908111218_sbc3ox.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/sevupixikevimitefa.pdfIn PDF document text
    • http://machulski.com/public/file/nasizitixakab.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/88964138225.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/lemudibumasofe.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/denumigoketesubixozu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613834ec5c14a---90117158022.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/69766413796.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/rokipujusewisokopu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130816398897---45704272740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=house+of+payne+season+9+putlockerPDF 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_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 17520 bytes
SHA-256: 7d5ce726982437e6a58d2d3c93192eea75367f5ff6839966eb758f3b9a8ede01
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10848 bytes
SHA-256: c0a75e88cfe6abf4a764a4b7289dd13d217ddf618fff65b19708feb954c372b6
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1