Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf13e09113d8035…

MALICIOUS

PDF

98.0 KB Created: 2021-08-15 23:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8e5b67daffd077eb7ea819e8eefbc30d SHA-1: f940302f79bdb25e5f629b778a143abdedecf9f2 SHA-256: 3cf13e09113d80358bce3108f1cd87dfa1482a6730d7c67658e216119e268cf4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary function appears to be redirecting users to external sites, likely for phishing or to 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://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/2167780031.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1662163af---20166841465.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/65572340205.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92823eb2fbafd77fc1a48908fc92f284/wovutodinar.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160800a4179892---lipetagekejoxejomativawil.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19428993082.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/73588595124.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/57299643796.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d4790826caf---69709686578.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/14756667578.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/jozuge.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1214ef0b2---61237228299.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/61398059850.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/bewupomol.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/49058630923.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a63a3ff5---54286613914.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b42ca398e---jivarawu.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/wudowisedusebilelol.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608999714aa1d---41972242586.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210813_61F9B77BB5DD3C11.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7fa47db1e---vuxujosut.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a4be3246---45714148920.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/df6f5e455adcef51424af0e78ced20a9/rifan.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f91f768aa---buxelojuvidutetane.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/foselanusixidex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+the+different+types+of+bandaging+techniquesPDF 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_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 16684 bytes
SHA-256: 069bca72849d96e0813c45040e52a7347c71b0a869f4effd90616e5a657ad029
font_01_sfnt_off000146a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A4 11344 bytes
SHA-256: f545cb2ac0ecc61d3ce09173c67d214f21d9641995e05e5e80f5056bbf5b2e64
font_02_sfnt_off0001609a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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