Malicious PDF — malware analysis report

Static analysis result for SHA-256 d864c348d8c9902d…

MALICIOUS

PDF

75.7 KB Created: 2021-06-25 17:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ff9b58f543f0f07fc9904c4295e48b3 SHA-1: c1ca3388a63d946b6fd71a657f8c9e3069034377 SHA-256: d864c348d8c9902da0a4e8a1bd910e5584ec294d91333c08a210cd92000362f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on domains identified as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/1659911224.pdf In PDF document text
    • http://archinfo.ru/uploads/file/sisimabojipa.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/77342891138.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c74584e0a93---konetewuxanebirizupimo.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/jupatiwapisiraro.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/047db8c7d0b8df771d6ab9d9cdcdd980/jokibibabojabufa.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///30347668533.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1eebe8638---likibawurisupez.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a1832005---monepufotas.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/3704796290.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9223bd6b6---89036181598.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pu31sjo1dijk04oenlkr8eju92/80101684360.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/95284974415.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///dotirikexamalulorozapir.pdfIn PDF document text
    • http://katachizu.com/img/news/files/gijikawogebejemaw.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/97774518992.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zaxisezuxanu.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83545562549.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba1cc2f3e---tafuj.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bixilovemebevuruguvogivo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b8ecc5a06887a8d1a0a798420cda0726/49986112846.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac7823814---dolanoxokojovemewukajara.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bbf670719b0863913b352243248a2894/wusamunonakuninikasesoxod.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcece28707---jonet.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d2e71f76f04e4bf621c7e65851563934/46900218210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=heaviside+step+function+laplacePDF 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_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 10668 bytes
SHA-256: 2533b37b444e81d69da328548e375747f74001d7d2962c8b049fa89c8c507caa
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 16372 bytes
SHA-256: 026cbeaf62e6e80454aa0949dd085587f10674783fa996ea34c64242165b1d4c