Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc2beb5a9fd729c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 15:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e67938ce6537d1a86902bc92a3bf0af SHA-1: dede036a1eddd84e73597fa13ab2435d5da47118 SHA-256: 3fc2beb5a9fd729c381bebdf3e73723f300a60877ddd7d0d13cea358e8dbfd29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URLs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/046222a5afad7a6ea2fcbe3f9e005fb9/77320465916.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf253f425---12696185680.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb87c00921b---worabosozafez.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d7f7ec35f4268cda686b0029ee7884f6/najomasepunurebikusivu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/84941945259.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3fdc0df6---kekogitu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0f2bbe76f---20410818089.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/daporawetupila.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/73436146102.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630048712.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/gokawigaxeruwulituv.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/32585771915.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/51126556002.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8b4bf38645af021a1452bfb135db6504/punawonukumawelul.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/44621961012.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/d935f6ed87e9e3e6a4195ef3d1eebd12/71405735666.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/48998491677.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ml6b9g3u7cgpm210oi4vqdlmi0/25710764774.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/36aa3356b3580b34591dafbafda513b0/57292374806.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d6b86edf3a86d69fced10fcd5ec06ae6/66736543254.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/77366469354.pdfIn PDF document text
    • https://kar360.com/resimler/files/sakitebepeminekigugijujud.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c71c406b0---4448565735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=handwriting+worksheets+for+grade+6PDF 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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 17876 bytes
SHA-256: 592f95495f58e71a07afa4895638e545b6a2329bf839e98f75cd50b8aba46df9
font_02_sfnt_off00013a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 10924 bytes
SHA-256: c0d5ec7f23db08c2ce8bf24db493c8a5709640a4933fcd495e4a9b958442fd89

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