Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac6f91e463e03b4…

MALICIOUS

PDF

90.3 KB Created: 2021-07-22 19:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b88e1c08db689da318dfb46a12b6dfcb SHA-1: 5e926c0b2bcda286d9aa93c4ebf1c71969755309 SHA-256: dac6f91e463e03b4c55433ff4df008fd0dbb3034440dabb427ea3d635827a4dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage distribution or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware delivery. No scripts were extracted, but the structure implies a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097484d9e072---15341296956.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ad0a4f3b5fb7ed1eea231e5349ff918b/82335000858.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/c66cs450ntegunni4bffsu6g8a/77167454275.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a13a001157---87297996734.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/bipajafafejapiroxewuzojok.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/85979333798.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c170c0b9c3---92433631178.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e7643e03295cbb67f10007150460efae/vevuwudumek.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/lukadobadaxumowazeka.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0e908080bf0c0b1f68c8544feccebda4/dowamuvu.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/lirudavadow.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106140518264544.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o2cc71g5mhrlklhdsrbkgn54qc/1673240222.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0774c951---80879230065.pdfIn PDF document text
    • https://camelcarpet.org/d/files/ririzapikav.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e284442a664---7070068637.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/sipixu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160991d74aae16---tufezibe.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zimizakawosasiwi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5ee203c114c5bdd3d7fe14aa640530f2/vimanoxokomopemiwemu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6uubvdu9jj2lhuiv726u1vq392/dasoloxifanalepugalex.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/kifofatirovagidajaki.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/pemugerinumugojemufutofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=main+function+of+nephronPDF 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_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 16892 bytes
SHA-256: be11b8448b8a9a90ebbd3837a66f75ba7a20390ec5ee08969c254d2422271d43
font_02_sfnt_off0001432c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432C 10456 bytes
SHA-256: 7812abfeefa812cba67404165bfb46f6455598a529a9986967664089fd31c663

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