Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8146c1b28e28f94…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 19:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37e8cf268ea45173ab8400c4db87f848 SHA-1: d724e3160131161e7748d6b4d88d15776d903832 SHA-256: d8146c1b28e28f9436330490573e8ca3eb35aa41f6fe3cb1083eafd18e754681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, identified as a link farm. The ML classifier and ClamAV heuristic strongly indicate malicious intent, specifically phishing. Although no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7d2fbc967bc066bb888da5571a6a64e3/zeketotebodeved.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/j1nbkvqbqch4j11cinu5tc906f/gokipimerinikixusifov.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096652436c45---62501768459.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dcca5a4ee---pasidojenidavulumum.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d921d63c3c0---41062214207.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f3600181cc1---16119364554.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/65090824652.pdfIn PDF document text
    • https://kuepancong.com/contents//files/29515325253.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/vixusakujevo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b759ec874---jevutat.pdfIn PDF document text
    • https://cncunse.com/d/files/kidejijosora.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/6194673064.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/fugozomesifujajawalevop.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/bakajakixazadin.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/vunawojesador.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c520dd8d10d---dekixadixitejapip.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a11495040c6---34222452818.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/76225397563.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/685288015.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160779e462a21f---24968237180.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/67iqf5f0igrdm2esih96rhmddk/8142921316.pdfIn PDF document text
    • https://beaszemin.com/files/buliritetulubetomasil.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/zepegejejazipakakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fender+frontman+reverb+amp+38w+manualPDF 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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 19680 bytes
SHA-256: ee6748a8d9e39b6ab895bf1335e48eb3865c978c71f0fbcbfd67ac7f9c80df2d
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 11148 bytes
SHA-256: af4d5a27a5fccc0d700938c3fd9737e750b8535d57a07229362a39367ed3935c