Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe42b6f5a5b2d3a7…

MALICIOUS

PDF

76.6 KB Created: 2021-09-22 19:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 049b7c55735a72abc53f0de957b3badf SHA-1: 22395fbc24674470c91831f237c4ec9115e36d10 SHA-256: fe42b6f5a5b2d3a79742f66e15424332fc13c7ebe8f7f2fab6906b8fc5366203
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm suggests an attempt to obscure the final destination or distribute malware through multiple compromised sites. The presence of external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=pixamotion+pro+apk PDF link annotation
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/32a948c11c315fea71c0707b57142eb5/96773965447.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/jopemarik.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/rojewenasegejug.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/957529620.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/19904946685.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/rixujaked.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161416687a3dd1---tesogijefudolamuke.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/kulibe.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/kovakazu.pdfIn PDF document text
    • https://tch.lu/files/files/91771955267.pdfIn PDF document text
    • http://15881588.com/ckupload/files/91471465021.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dcde39c98218b5a1ed8f9a22126b4363/taruxoxanatakirutu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613133b0d53e3---85030837979.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/kegaxezebesoravopiwoles.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/wevik.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/63801893401.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b8c3dac---demivekevi.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/goxisusodibisopefuragosim.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/gozegipesekun.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/ritanogadisujemoba.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/96456568489.pdfIn PDF document text
    • https://mmtours.si/uploads/83039123715.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/63000830068.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/sopekugerudarodufabe.pdfIn PDF document text
    • https://granitnet.hu/editor_up/mipevakejorida.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/lilofix.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_off0000ccda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDA 10260 bytes
SHA-256: 6c64acc88a666ab21ef4238004e55d319c1a52615da0a3d77a650e4d55ea807e
font_01_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 15904 bytes
SHA-256: e68da04d9cb507d24f8856f55c343444204d911211df83f3384f96416300e413
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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