Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b662a0c3185abf…

MALICIOUS

PDF

83.2 KB Created: 2021-07-07 18:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19482da9b85bef7459c4d182497a7646 SHA-1: 23fe7fbc8c332069c4a0e8898617e3684bda85e3 SHA-256: 51b662a0c3185abf09a423831a14fd32ed1e71498bbf43b8e040b18005f6b57c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. This structure is indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=in+the+butt PDF link annotation
    • http://m2m2design.com/userfiles/datogoj.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/25478591303.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660a43b193---waretiwoj.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rovige.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/16600522251.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160852f3d229ef---donedutotatir.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb1a7fa79---89058716111.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e13d4c764---7855598376.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b5a4bf1b7030d0282e5eb0ef4f749f4c/barozilasidakole.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec775467cd---kemorumiwotarosim.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/zexalokefa.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/46747459533.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/belazekolojeramaxosinev.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/nukakazarepifipisipozuni.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210603_170927.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/otab06depv26fcu0n42ohksuep/54986142679.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/kojanubumibakakuj.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210624_6CB975478452E0A5.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/660f27d575ebd3d6399b09308b29f30a/71672272169.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/wafiguwusaduwu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6435af02---dekux.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/79833225177.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/senaxikevez.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c443552726---rabuluge.pdfIn PDF document text
    • https://faprosid.com/file/kafopoxe.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1183a8c3c---belejeborilitibewuxenik.pdfIn PDF document text
    • 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 24120 bytes
SHA-256: df2dcf0868270fc2fbd343954f264b4365435932dfcac4bc7437c6ad4ae246eb
font_01_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12966 9708 bytes
SHA-256: 0e99303ba9ee2adb527fc8e89c46ee7ce69ff6d6a8c45a14a16b74df32b3a9c2

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