Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d27a4ea59fb8b63…

MALICIOUS

PDF

68.5 KB Created: 2021-09-06 06:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d6e3cb47cc57606fc9312365287dfe4 SHA-1: a391f8feb070f834647b61fe82da67dada4d1b72 SHA-256: 8d27a4ea59fb8b63260ec2b70f13abf83f4115d1aa022709ca6c9cf6f3aa559a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be hosted on compromised CMS uploads or disposable hosting. The presence of external URIs and the nature of the link farm suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL distribution strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://giridhareye.org/ckfinder/userfiles/files/12114216833.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/mogukugerixaziped.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/93609565620.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c05cc7951---totaradupuzem.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b948550926c0c1a617228532fd9e8c34/48925314301.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/bokitowaguzozodoxilebezo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112038d52ed7---tozalazorubemasumanazo.pdfIn PDF document text
    • https://signika.pl/Upload/file/mivuzubosapazovebepajaza.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/viduxuk.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8225a4f39---57925820480.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129da0270afc---97481791236.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7b2d6363b07e301383e3156b5e2d58e4/46473121546.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/29985801080.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lolemiluwisegaru.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/11278899207.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jp2o5nvmro6lormc535ndue23m/lafafamiporelolegomazikix.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tejegopove.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075cbd7d2ba0---31068746185.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ac4e0a558f7f8e679fe4e8059e4970e/64722090879.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8481b45cee---bolikarilibexemizuvo.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/88877384912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=southern+northern+and+western+hybridization+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_off0000ae87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 11124 bytes
SHA-256: 0dcba0f3e82cd16712a9747d174155f6dd80cc293130a4100eba2a47ee69a956
font_02_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 14784 bytes
SHA-256: a674e4af1a2bb587c87101b92a5c7e2af2dac2d82794009c1b6335f42d1e1577

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