Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c061cfcde2c003…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 10:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c53394523a2170c375a39e3b7331b2bb SHA-1: e7a9b027216b4f503333a3c04493105312848c4b SHA-256: 54c061cfcde2c003cd2e5bb95a0f911c944d4e84de019ae8194feaf94e19c1ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The PDF itself contains obfuscated content, suggesting an attempt to obscure its true purpose, which is likely to direct users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sa2jmd6tq3a2sjoqp6nlc34r66/tarusidubuxavipesasu.pdf In PDF document text
    • http://gidaero.com/upload/fckeditor/file/8324613390.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/44802828925.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/1548443865.pdfIn PDF document text
    • http://popmetre.com/news/files/8812158319.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zoxovivemozuwujo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49360ef06---91195335519.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/58454893114.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/32579228191.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fa2b0387---27537938591.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/846505659ac806230453073b44d18312/22444205871.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/voguramukasevasafolix.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210911051711.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161406f16620a3---71768975926.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/93084875039.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f123d31d---sajidusolibunididetogi.pdfIn PDF document text
    • http://machulski.com/public/file/53889820137.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/betonaruwotuf.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e69aa026126a454bfc4a3854bdd201a0/94615118061.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/renerekiloxar.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/77320516144.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/koxemanogo.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/fowoki.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/92284025375.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/geneperugarimovegoze.pdfIn PDF document text
    • http://tochalco.com/uploads/files/xodivoberutegeripuvoxi.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/32007172082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=words+that+start+with+r+and+end+with+aPDF 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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 10380 bytes
SHA-256: 10bb2469aea51c99353ef6929721343332d0c5cabde55d5ea93de8ad858516e1
font_01_sfnt_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 17928 bytes
SHA-256: 32cff5ba1491e5b0230836c8e8f5562afc9d1c2676140ef7db431782a39736e6
font_02_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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