Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ce1cacc90c17d0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 16:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef22e7272c6786ebb90958b7acf79f6e SHA-1: 8ad48241f3632a3acdc8610708d76172a4cd1b97 SHA-256: 27ce1cacc90c17d0776c9d85bf8557cbfa0e6bc6cb3febcd9c59c3ce46b889eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://karpatskiles.ru/store/files/govaxilisotudel.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b90a9df9dd---dikivomotog.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///miwuxeruroso.pdfIn PDF document text
    • http://alptw.com/images/files/6306149305.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072dee8182db---zurakafojomukuwetiji.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/lisalitajotiponegodanil.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deee5ac1689---65757696444.pdfIn PDF document text
    • https://rosycaffe.com/file/8271323771.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160866a9ec5fcc---sorumokotanijixamo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10657bd539---logibifat.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/94036643067.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d378cecd21---wixujezunisamilotito.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/fozekemixamukeda.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/i1v4cr2s5m7agnr9qr55lchcns/fapimejepefin.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/jogivudezitifakumop.pdfIn PDF document text
    • http://ciskmv.com/css/file/xalakutinetekimobin.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/12827503064.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1r3e8urqfergraufst5aeo51k0/40571641614.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/1a1c246929eaf4deae4123d087b73444/16765834414.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098262954ca1---lunesikezefakinabel.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b33d9a2d1---tiporasurelopumagokiri.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/033f569f957175d9569e95d5334dc388/36760241094.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/96669123106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=freckle+juice+pdf+freePDF 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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 18472 bytes
SHA-256: 9965277bc6e4bbae0a93497b5c5c1365a96aa9984500857dd4d3e0cd689d75e3
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 10260 bytes
SHA-256: 203c9d379606f3543b3d65fee74a4ca2df3e6d30653ca23c19895bedc83c9d1a

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