Malicious PDF — malware analysis report

Static analysis result for SHA-256 487db0a7c2280d58…

MALICIOUS

PDF

88.0 KB Created: 2021-07-09 17:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0572c8c8783186e025fd6f8baa5af942 SHA-1: 2e395408b176a4a09f98e96074c8cc193fb25cfe SHA-256: 487db0a7c2280d58fe1a382754582532ca9869d9a04ed8f5e45bb865043cbe85
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/61434624160.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uvcvu9hqq2hsavo4i30dsbu32g/zerutipejogupem.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09dc68e200---33091130730.pdfIn PDF document text
    • http://adveotec.com/img/file/nenobawawom.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/40029740014.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/57930985746.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/17468172122.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab42c6eb6c0---tojisewurixoguvimaw.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71a42e686---5314421787.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/sbdhl2qe62fj4lqlbfthi9k0nr/lafozigulejubiwani.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/fupevubisuwoze.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fexijoramazudubale.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db83813b3---xopukutegedilutisizosu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c23c1377f51---268898466.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/524e5e2c4289da17f7b7df431e1889f8/40555661359.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/ledatoxisigasufuluroferu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/22128b8deca5dc0ccd17e54d3c0575bb/65066820162.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/jugozelapi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db423028c6---53288377165.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5b57b3ec---77673584882.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/dcc0f75c499cfa376273387153dce1c6/32255592718.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c853c3f046---xujijabafelapamo.pdfIn PDF document text
    • http://4bx.pl/public/file/25004650612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=is+eating+meat+bad+for+youPDF 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_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 10956 bytes
SHA-256: 34d5ffeb386140cc0ee4ea4a7680045f996b5484bf1d5e8162b68e0efb811201
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 17516 bytes
SHA-256: e0b0d9e87de40b76042591d2f2e49a82885a8b816bd57b48218db8f0b7caaee0
font_02_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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