Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c065afa504f4bf…

MALICIOUS

PDF

99.8 KB Created: 2021-08-06 13:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 778ea5af07de2888602a272939c6501d SHA-1: d8142b0303b90ba41b434619cfee0aee08c265b6 SHA-256: f6c065afa504f4bfbd7fbbb5b02d48df7b8da6fb8358b571e762de7d30b61de1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The document's structure and embedded links strongly suggest an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://atsrealtyvietnam.com/upload/files/redujexunijesoj.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bu081u0cuce8qrjohb1aie81r/mikezutemofodop.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/utal3c3i1sqofma360rgl5u1p2/47451893353.pdfIn PDF document text
    • http://safetypath.net/cms_images/64754864661.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739fc8b39be---68316821781.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/46380194541.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ki6t8vodjomuud76qdthik28be/novutagepabetad.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad320f087b3---86384626378.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c1e4705ce399f075940c0cebcb509b4f/vusefipimupefuzemebenok.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/lusagufumuvisetiniwif.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4adeb2c2317d81f81fa89b0bf797b364/11869856663.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/22bdd2b4dc0a288bdb4f80d1fdc6375f/32588238246.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f24b108734d1e5754ffbcf37db6324a1/91514446477.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/xelexepatijekizarejax.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/35210477499.pdfIn PDF document text
    • https://maturana.cl/upload/file/rabaroxetapuj.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/movorefopitizamasunorega.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/18ab17422b9eb0c1a5acbae6407cb589/nijoxenibolagewokabata.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/gebarujozowid.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b1230c8d---21655609414.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/nurapekitivivefona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=is+ddos+illegal+in+canadaPDF 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_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD6 10296 bytes
SHA-256: c438b03b4293f28b2b8d372d20f94c8495cdc6b6c1e11fa82daef978d9fb06bd
font_02_sfnt_off000153d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D9 17224 bytes
SHA-256: 0c19ad5f9981738e8456078653dd2ed07ef4d1ab667100f9e819eb3e67b8315b

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