Malicious PDF — malware analysis report

Static analysis result for SHA-256 742dc6beffa16252…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 18:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6e5f1dcab67cab990ca5bdcd6ab7cf08 SHA-1: 54291e1261d33810668506a688dd285a366f1db0 SHA-256: 742dc6beffa1625264f383d8f109e298a6fb085e7e02296c773684202318fef3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or distribution attempt. The presence of embedded JavaScript, though not directly analyzed for specific actions, is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://emirates-offshore.com/uploads/image/file/xaraxilekobalakote.pdf In PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/80765535497.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/50696543612.pdfIn PDF document text
    • https://medtek.vn/storage/file/zekofojisupisamutilevoxa.pdfIn PDF document text
    • http://honda-vo.com/upload/file/73141107364.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/jamomo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/13739234092.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/tazugevizujevumulo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/98d7e88cec43e17ae5f730f1caeb30ba/83118849019.pdfIn PDF document text
    • https://khanikango.in/file/zifetozufibijekopo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a161bf88b01---38587709731.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/96177301645.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/4ce19cfe23e02f862279bab146edb96b/xizifofesexirot.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/5612785565.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/80957982885.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/g8ujfa7vsag59khcg1vjmd5ks7/5079253193.pdfIn PDF document text
    • https://btegypt.com/file/50205448925.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/t8v11evkg22opvg28ordege10q/mulufadadalazasozelag.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1ebc6296---difixupofijafupuf.pdfIn PDF document text
    • https://x-software.cz/data/file/tuxofiwulidenog.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/46461619220.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9517f34b36---napoluwutatagawigexaf.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16125d447e1135---98588095325.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16128134fa7729---37534179960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=calend%C3%A1rio+2021+pdf+brasilPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EA 15572 bytes
SHA-256: 47b0724464f6397a45c20fd5517e289eaf0c53d0d56b7e1c6d6512b3ab4aaf1a
font_01_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 11036 bytes
SHA-256: de879dbd8d560aef75f3da78aaffae55d7b01fddf03e744f0ed8aa6aa4896248

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