Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42c89437e6995d3…

MALICIOUS

PDF

83.7 KB Created: 2021-08-09 02:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7b9923eef5c993d16a69b6920d30b4c SHA-1: d3073dda7e740f4f212be889618fc06fcd88e79a SHA-256: c42c89437e6995d35c1a9be18d161535f278cd988515ad5b9f0b62f0c5e71667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs indicate a link farm designed to redirect users to potentially malicious content. Although no scripts were explicitly extracted, the nature of the links suggests an attempt to lead users to phishing sites or download further malware, aligning with a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8465adl24lj3lsldtuiqp9pf64/63533636150.pdf In PDF document text
    • http://americansemitruckparts.com/d/files/85424670734.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/2985810108.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/88748296771.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbd1e7bcad---foteguxisaveto.pdfIn PDF document text
    • http://lulanjina.net/upload/files/tekupoxugekabexuvasiwed.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/vonijilebabali.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/serotolipotaginexisof.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3730bb01---bugorujujewukemirede.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdb3f176e---wunamusabuguxupimabuto.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133cb11de2---nepuvibudagefatufip.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/55facf4a86ee454d7e0db5ec7ea900eb/gupaxuwifazuvawikibedu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/006dda3b956029e7d5892066ea0fc5fc/jonizonilozikegevuz.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/tupepubetopezuj.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61185695950.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/69341354303.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/vosotinanesib.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/mkq5flon8uur87v1kf43hqnq25/wotewinitazotafixij.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/popaviveriwogewabap.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16c5b566a---30591873652.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/809b723f67a8417c74e8122a2858d3a0/jojisexilag.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcb614971---mofilapu.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/vobilinoxu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d948bb98d28dfcb297f5507974d510d8/bezamobituga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=he%27s+a+pirate+piano+sheet+music+easy+versionPDF 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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 17840 bytes
SHA-256: 31313a5a9e9f50eab09ce8365cd593e245ea00f27de73886a2200c44c963542c
font_02_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 10896 bytes
SHA-256: 34a3904eb58932b91db9de64dacc63dd54c77b57f7e21b877cc24d2c1cac9d77