Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b33b3a85febc57…

MALICIOUS

PDF

79.4 KB Created: 2021-08-28 10:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 44c664a15bec9c6b42666175581c4630 SHA-1: 5af911e35671d891aaff16f895f657a4165f37bc SHA-256: f3b33b3a85febc57a5a0a12ede563568466941d4a363f576d68c092026a8d298
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/5ea4e1c2fe35e46a74d06581896761b6/82141249007.pdf In PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/jujex.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/49114046708.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/09ebba24b55553d66ebca952b2224c23/20010283613.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/22970457381.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/woxopavigedejagub.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078564e23e3a---pefadubekux.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/67165e361a69ec89bf9eb95d6517c515/vezef.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/57003003644.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/89168337186.pdfIn PDF document text
    • http://synphabase.ch/upload/file/bazeviniwenolezo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8469162075---mosenexizavejamotapuza.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085438c75d77---51273184675.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/62569123619.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/65734032933.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/26240601139.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/dec707d30d291e3a1633226fd62eb30d/69768832066.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nazexo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3524b1f9ab3631e7a170e791cce74661/xuvozigoses.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612773d83a9ab---23452995667.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d0d02efbf---11430927584.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0426471001626918874.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/204b74fcb2fd218e4862a3d32a1794c0/63836732616.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/009fa2ea519773b1c2e59f849b5e3f0d/14049191857.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7658e333---wikipoxoxiterube.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/tujulijuzasosibadefif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+in+apple+pie+spice+blendPDF 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_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 17596 bytes
SHA-256: bd03977c76cca03c67af2458ed715e56cdcf1fd726c2b0e0afa3ab3bf04aed05
font_02_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 10524 bytes
SHA-256: 200f4ccbded0b1ca40c5ef79f9cf61d0fafbddd29f8c3442d171710e7d576095

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