Malicious PDF — malware analysis report

Static analysis result for SHA-256 583a6b48f3be3f76…

MALICIOUS

PDF

97.0 KB Created: 2021-08-13 00:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e38527cc5b83aac5be84ae9456230ad2 SHA-1: 61f1b545a23a2d881bd191c5a1b4ac952bcb2d69 SHA-256: 583a6b48f3be3f761bf1e8c469c6c72fe2774540fe9086e5e9a967ba9d2248d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/t2d4e89l5s7p3s74lju5dloeb5/wilasojemu.pdf In PDF document text
    • https://hanahana.vn/media/ftp/file/64004592406.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/lejibi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4ebd5fac9f7351ff732dfc1e424f735d/27290730139.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d93429d0---41324291163.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tixikedonoravipu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/16868065482317adb6063ee28e588e7c/wasagipevakizerapuselifur.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/40636164183.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ceec233a3---senajuzakefodexataw.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/zujuzogipelutivukatimo.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/67013126496.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ekqmnvbas97c80ppjdi907t6l3/semifof.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b91fb6a621d4e861fd6cfe2b84795096/71858148789.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/rujesubixazujevorezu.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/nimojadodemixibowuguvuze.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/puou0r6opq3jvj9iok15okbm74/mevonadazezemuzi.pdfIn PDF document text
    • http://aldercrest.com/files/xitupetojewejiwa.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/99863917992.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e2fa5e084e7b99c4cab64de1ec3f5227/9071620111.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/vasolivevojijekerovera.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/juxepaxurijalares.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/weminamapototezadon.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b12fffffc5f880c8b83a91d56d96305d/29998090259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stardew+valley+anime+mod+smapiPDF 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_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 10896 bytes
SHA-256: 5341e80bbab4e649047460769395506e5ebb03130d7376812b3947713f792935
font_01_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFF 22868 bytes
SHA-256: 437b20b734584282846a7ef3fa824fa72ff13fe1e1f16a82618fcffccc90f893

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