Malicious PDF — malware analysis report

Static analysis result for SHA-256 666e8723ea4b9f52…

MALICIOUS

PDF

83.7 KB Created: 2021-07-05 16:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 090870aafe189ad89d10af3e827af063 SHA-1: e8d965eb0f3a019ef1ca70ad24491591428de23e SHA-256: 666e8723ea4b9f5224b721b1cafdbb519c0a8e54b3a4de0f81fa45ce7d1796a9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to compromised WordPress sites and potentially disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=cbse+class+11+english+snapshot+chapter+1+question+answers PDF link annotation
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qiobljqfqpgvfniv2un3qdvdis/7217182739.pdfIn PDF document text
    • http://aps-mes.com/files/file/gajidaraxikubedelux.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/504431f5f4e21be788bcce517c72f158/87003049031.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gla9dc9nph57uu9t88464o82f2/13406047506.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9116254ba7---guvatenokumedaruraxu.pdfPDF link annotation
    • http://charivne.info/images/file/rofuzulobi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752cb24c655---88714564789.pdfIn PDF document text
    • http://www.celso.org/download/bajiwidalegeletigonalewa.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb0bc4186---90862020222.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f7edc06ec---14077575213.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fe38cec19b6d35b77a0261138821660/63470162598.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/74250595241.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf732e4d95---baloburikusanota.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s41lf6nnvootd9l8h40tvopra2/dimuwanumiwokavisejukuk.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/4969939792.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2914b429---48582479472.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429195129582742.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0ff41a5df---71875488132.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf5a29e130---96171110526.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/dawusaxusugatix.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/62387695548.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/65065681818.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/81053408668.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/84650247863.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 16828 bytes
SHA-256: 01857c2a57062a70fc0ede6fa20d976febd6bf91ffd3bd9c722ca7e3c0481449
font_02_sfnt_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 11208 bytes
SHA-256: 98491884f829bcc3e677fdb3a25c02b1e28c44f2bdfd3203d4f92ebd69ae4d2a

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