Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28066e84fdfd67e…

MALICIOUS

PDF

91.7 KB Created: 2021-07-29 21:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2e838e98a7377ec4792e53d574045c79 SHA-1: e16b81978508458df14be4e3c5081ca9e7eebeff SHA-256: d28066e84fdfd67e387a553e7d78c01825f44a6da4e156451e99074c386395aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160828bc372881---votekakeviragusika.pdf In PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/wabikeguxumapekunexaw.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/75141964289.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/parofitet.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/jizerilaxilujego.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/mixugowegugilak.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed07739524da2e1fa5d76abcd03a175d/meruvetewadipuzive.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c018c1e370---81154924204.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0pv4em3bpktf9pu5v9djuscfvh/motokojiba.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d09811c2ede---96935918917.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/gozukosorutesixulujokovo.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b558f4e023d189b0ee0bc07d4dad6045/bamasef.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d4630c3b673a989deaf003bb613db2a2/71500689953.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/27illn1uahtrnrg0pgqfmsliqj/83613264444.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4498c09dfbd7c3d16ca57d274eb359dc/meziwexepizoxawekevu.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/fupopukasuvix.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7267f256d3---vetilapupogi.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/88355912391.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fe0b9288fafbe14017ddd9b00f1cd3ec/kudup.pdfIn PDF document text
    • http://sakem.org/userfiles/files/lusuwuforu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072348579676---kixoniveguxa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f473253c9e---44804193825.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nq3qnru8rprh667sa36r1d2qq1/vejerujer.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1611c7453---tawesetusibomezokoditoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fifa+16+ultimate+team+mod+apkPDF 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_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 22912 bytes
SHA-256: 1516e49d8bb701f7c9261dbe3b0f5410ba9183589919932f29c4e614f69fe676
font_01_sfnt_off0001303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 10676 bytes
SHA-256: 00bd52a7d13e8ece2dfc18c1a8833b86ff0eefa3c10361524cea5ca47aed428a
font_02_sfnt_off000148c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1