Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed8a139cb410429…

MALICIOUS

PDF

116.0 KB Created: 2021-09-08 00:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f46a5a7a8f5b42de17daa8a92c7a583 SHA-1: 1265a9423ae444b9f21370dbd20626901e2a410c SHA-256: 6ed8a139cb4104298bc41a8ecbb4c631d2eb04aef5544b446bd98efb3cae763f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external PDF files, some hosted on compromised CMS uploads. This pattern suggests an attempt to manipulate search engine results or distribute further malicious content, potentially through social engineering or exploiting vulnerabilities in linked documents. No scripts were extracted, but the PDF structure itself contains links that are the primary vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9svefd46jmtr2hq691er95p3n2/liluzo.pdf In PDF document text
    • https://snqrsl.quebec/upload/editor/file/7698794230.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/ravomatijosifaza.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2848be8dd---41978913924.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/22279798943.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/17/11219770417.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/kaxirajobadi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/964eb9ce0137e7279efeb2bad47736b2/53847468680.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/fngneni1mdrrcpeti7orp4bt80/20710294856.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/754c536f45982d6c0f29fe2780c4be53/43240074185.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4aa059280---gojegutit.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e86e26d5ed---dexawawos.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2kobae620ua9h59gi5klca4ft4/fovudotigikojizo.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/67073101555.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/xamogaxulelivunave.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798b2cad41b---23531924043.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/44292698658.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gosogalonideledizenugi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d1f6b7230d0bd27cbd899d3e1ce0a460/vajanuwakiwinirog.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/82804808423.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f02774223---55751388125.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kagomazosuxev.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7311145833---parexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ludwig+wittgenstein+philosophical+investigations+pdfPDF 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_off00015ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE6 11008 bytes
SHA-256: 9569b0992270511517cd23f71a57698c378dc8183126a1e11b101c9aee45cb6d
font_01_sfnt_off00017841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19053 19136 bytes
SHA-256: daea3752b25dec76fa617b6a2021f09ba1242ddcfe375c168aadeef1c547c75c

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