Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd26528e6e859cf…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 22:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8130afe78c6d6c9b2a11d99a5fdb03c SHA-1: afd2a9521bee9a58f723af2781f6558fd3a0bab6 SHA-256: 8cd26528e6e859cfe734fc605b7bad5484a3232722b45d52c73987f7d9087a44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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://allytemp.ru/uplcv?utm_term=distance+to+bisbee PDF link annotation
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vi0imicu2v91gb05cb4fasr7gq/zupelunabawarojuf.pdfIn PDF document text
    • https://aneri12.cz/res/file/podiwiruleraxafi.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/84421154687.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/mjer7h4cg2njn4f0m42f40m84i/munogevokil.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724b0c61596---fixupekadiso.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/84749984441.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/janekefefisu.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/95501596513.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/odcedl39buiqvbhob2q3v74dp7/69155965827.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160750def976eb---1282810678.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/gasitajona.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b47248e9e83---zawep.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/dedidup.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/fiditodewalemem.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0409cb7a---48713395982.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e6cc7209e7b10714a9fbec06c93026f6/59072596666.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2074dde451042ed5f4cacd40cb73b606/48593711653.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wewokaniweju.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e46b03b9d07a78dcb85e7809a5b86d83/ligena.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/753d0273aebfe0e3750943fe8e440305/kobitutiponam.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/71dub9la0e1nhtdrs9dr5qnha9/gaxuruvemokowaz.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/a40dff6b7903eea7ea11fbafd1e856bf/zinekowutamitisudemidan.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/zuxadededutudomavepomejin.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160826ebf70da6---serazutujavotewazuro.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/kawafazugejo.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3ffdc659cea99949101b40875aea9c4/tekukunikekubugonewe.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://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_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 10220 bytes
SHA-256: b276c158b654ea16bb726fc127ff6e487ef1baee661cf84d486c55ada0f98944
font_01_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 17632 bytes
SHA-256: 76a295d48aec2c3375f3a2ac27a1ff4be9b63051958e84cbff9ad9fcfe77d6f8
font_02_sfnt_off00013dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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