Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c6397b783d175b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 19:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f62e249d33940dbf4c4521dff224a058 SHA-1: 3426c078403592dceeda37e47cda5b60bf522bfc SHA-256: 68c6397b783d175b678e0417d96ad6c34b44d83a01a3b9e6c14ca7a9394655b0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a tactic to distribute or obscure malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection, likely to lure users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd4aeaa4f508320bf8149ffc8c8b80eb/kaxatabatejigexebibunu.pdf In PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/mifinaxizotafejalewuti.pdfIn PDF document text
    • http://health-bridge.in/upload/file/poxotawixuvajekonetix.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/pokafopikumejafebisuwom.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kodomotuwekuxori.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210801173809.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/54508917071.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a36irmn5q8muljcq4vligf9vnv/69633540034.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/pefugilagujegof.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426fcdab54---zejedegodegivamulinaz.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/bc263f901df6b2a79945cbf60f991e46/67830604262.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/kirajalavezed.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce146b1d781---3230489328.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3fd9850a---pipen.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2r66smggd2nsd5oueabotb0eo7/78595077476.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/11290357341.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6711b0a86a---peduzinamus.pdfIn PDF document text
    • http://asfalon.com/__files/file/1353817934.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745eac0e810---90651136411.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210802155143.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf8810f15---tugutowazadexumax.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/30214343778.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210608_C84E3B6091C6D45E.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/86991428622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cobalt+2016+1.8+ltz+manualPDF 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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 10844 bytes
SHA-256: 8104e3f8c095cd53454a24adca8bd7c34537dbc0815fa80ae576720f69bced35
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 19164 bytes
SHA-256: f26a97220b4366c5e4475357846e5eab5cd428255cd15b1b8246cf12ea0a458f

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