Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bc843ebaed292e…

MALICIOUS

PDF

98.7 KB Created: 2021-06-29 10:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 560c824b6a33846deb40b7ae0fc94e63 SHA-1: 81e1d940357f426042bf215ca6f5cde229905de8 SHA-256: b1bc843ebaed292e1fcd3e3cd16d5f48eb02d669d3fdcf8bdfc0b8bcd0c613e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were extracted, the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d2hknsrerlen6aursdjhq9b8lj/xogolo.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23591dc949---61203983502.pdfIn PDF document text
    • https://schmitz.cz/res/file/zilapevizizefale.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m5vhb3p27hu36rfohmqk4i8qhj/40329920811.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/81e35c4f410f1f7faab24921accb22bd/16748073443.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/14177181833.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160945aed8fa39---54475275670.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e524b5752f---majasux.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/90286041557.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/97610888781.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31c634221---gotizer.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083113b70c27---83699156882.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pn2i4921deff9ee7euhmmtjcbk/578113843.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/vdlt7fk22sg5dpvgkp58uo6fqt/7034624580.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/bomizosugizedofexezu.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/19943263982.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d326a542---piforenetowonapetipun.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68bab4dcba---foturuvikezutolosani.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/leziganonasipi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd867904ce1---timowefesezoramidumobulob.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b393a384543---85243623262.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/oqrnulqbes313spjg6cu0nrr5t/63248041409.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tuwanujagejasoguvi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/qso5qp2iif6lojfesdk7v183c1/zegawaloninuriwipajitew.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/59559781685.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/d13ibu087skvm3co3ham7rfijh/46495676446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=something+that+starts+with+the+letter+lPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 18692 bytes
SHA-256: ca2d7bafc3352717b6dd1a2dca291ea31eef75c3bc9aa030361d2c6fdb7eede9
font_01_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 10716 bytes
SHA-256: 843f5c1f269e7fdd98e97590c6a7500535df892829588bf5fc23b9ca27d64a9f
font_02_sfnt_off0001359b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359B 18244 bytes
SHA-256: 58874d819a9e9fd022f3aad8fb19de6048a30d13c4bcf5becf3cce709730e256
font_03_sfnt_off000164c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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