Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c93b1db04941f5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 03:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d259fdb3c29e9515558accb81f62f039 SHA-1: 4b6811ff853198037bad73ec255ecb626f2a3382 SHA-256: a9c93b1db04941f5e24a4c2ecc00e20af06f3478d0efeadfba9c14b1c9cca8e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. While no scripts were directly extracted, the nature of the URLs suggests an intent to redirect users to malicious or phishing content, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9ba70a91---mixofoj.pdf In PDF document text
    • http://aedelsur.com/contenido/files/wigekuburawa.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/pegonafoxevapawakup.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/73561200102.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132135ad2663---23748432120.pdfIn PDF document text
    • http://videocycling.info/files/file/63868294301.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/vuduxuxetimusixol.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/22592228347.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/tevadizome.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca94d21d4---57030388688.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b680c1b3---64600116788.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/zawadiwugibugijejepo.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161361fc67283a---27385248020.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c7be6e6---tufigakebubisezenafub.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/guxezolerutixorefodusugog.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b113aef50---lomanewovez.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/85824020256.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/51937398995.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/72006736007.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/959371929.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///12187916903.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/32793275930.pdfIn PDF document text
    • http://tcihk.com/userfiles/jijulifazemakol.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908101119.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/89728083938.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/84711677883.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/49616748487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+internal+storage+on+android+phonePDF 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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 17620 bytes
SHA-256: e9bd827d818e8b98dc52d6da7c0d79c5f90540ba6908f5a340ac48705ee12cea
font_02_sfnt_off00013511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 10664 bytes
SHA-256: 6e087a9bd7e2b584934dc83c67ed478648d3f431aeb5bae867482298b6ac67eb

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