Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e195a2953ab4ec6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 21:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e9bdc22f9616da8e34d994ea1f1e78c SHA-1: 6e58c3e3057b356ca5f5388508e9dce5c64d5e59 SHA-256: 5e195a2953ab4ec66494a8586c21de22d3ddb954c659cbfa9fdb99aad36f5ceb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tacchigroup.com/public/thread/risorse/file/27725907429.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e4397f5b96e6786accc6c02333576831/860279452.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2dkq0bi32hjjfu26jggcd63k0/tuvetaviwa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160beffa3b2944---vinovatimiruxu.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/8790124533.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/tafujerajonasogiwedidel.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/javujoletopadaze.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/92436651985.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/nasov.pdfIn PDF document text
    • http://elm3rad.com/file/72782476545.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5ad8f1cc80549f7091ca1ad4ca7dc7c3/nodemutir.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160893b0f8deab---16932043321.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/sanumopowapetudalu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/40919500186.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202108292321181018.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/83798724073.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8f8f293b---ruwugivigopujarulolozeve.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/fasumixatoba.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/16bc5a50540574c17e48abc899d79005/97541083622.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/87966428981.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/povukudaxozuworaniwusaw.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/dujimitetikisenozalazug.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7tkl2ta9ggbbsja0fl6ugn3ri0/rivalobewuxotevovojijid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=la+bella+y+la+bestia+cuento+infantil+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://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_off0000b5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EF 10824 bytes
SHA-256: 1bc2f42b904d05f41a93d79a83ab806a1b4c5d8ee9412f42d5bbbec1cb4bd195
font_01_sfnt_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 17708 bytes
SHA-256: 3194e659571a77196c667e1346c5b11fb6ba1b27108698d8d8f3703307d54a2c
font_02_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1