Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9bf0e537c8807c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 19:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b24ced5190704671399e68bb4a3c2c41 SHA-1: 2b279b01df33ebc6bd755f02bb46ea16934d0122 SHA-256: 8c9bf0e537c8807c649d8bbb2a4aaee74aa609f8889880440f939698119c9e38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, with numerous external URIs pointing to various websites, many hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing campaigns. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=data+mining+meaning+pdf PDF link annotation
    • http://kag.fr/userfiles/file/guxajepewemoratab.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c639d82dfe452b566e2ced1fa3f1b3db/4372698292.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gidoxatovofozunadeb.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/dae9651b8c7a6bc60b8e7816f34e00fc/58531795288.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0321e369---52405498624.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/kelalifafudilekawewovaji.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f043b200424---66625850349.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010fef5a46f---molelido.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513e605f41---safivef.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d8696ce6---zazaxisupike.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/45705361196.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/81541189192.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/25046869021.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/64773334648.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/visuravivutisemufepufaz.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/lezulabumazonuzizam.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e58ad4f9875db512547f67b51e30d5ee/dutokanamuzomimoxifa.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/77699222938.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/80106258570.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/jilixelipaw.pdfIn PDF document text
    • http://stefani.cz/fck/file/6898626687.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/pupegib.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/95554537319.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f8df6a475b3---sonebotewumewemazow.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/36855202852.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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 18112 bytes
SHA-256: 42f66816143d2153f9f6e3e27b38039d1fb4feec3297094788f50621ec6d87e1
font_02_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 10408 bytes
SHA-256: ffb8030392aba0d15ba8db1accbe5cbad9d4c4f365ed19489ae760e69929d1ef

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