Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86f2b6a7f10b525…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 06:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a399272719829dd665d68eb09a34663 SHA-1: e25fc777d9183391c72e0504878b6d2d38b41143 SHA-256: f86f2b6a7f10b5258db98c1c1cf9c1fef020ad1429cafa716e3f7eb754125245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16302398941942.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/masqo7rj0jb6mbe2jq2m7featd/65739956487.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210516095310.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/savox.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7ae2e160c5d8a58135d157936456c59a/gofexijinikuvagasobe.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/41951938025.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/071da3823662f9d8c49c881890c194e4/33663296411.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/buzeg.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3c867e66---80469913548.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/72773342963.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c8d6a8ba---36226899578.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160786072435d6---41418311688.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/dolomefijakorifetasuneli.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1534efe1fa2e03bc9748f02aa05b3702/78251985003.pdfIn PDF document text
    • http://xtra360.net/campannas/file/87317810518.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/5826249611.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9a6ffea1da745d0f5502557b605d23f1/vafuxogifupisizoma.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/zekarosada.pdfIn PDF document text
    • https://equinox-e.com/upload/files/gesevemubopupamekiwa.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/32917724700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=priest+pvp+wow+classicPDF 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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 18288 bytes
SHA-256: 5d7ad8245dd8e2569f8cd1b1c0955e82502a930f31fe26d925af53f31ae0a5c6
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 10416 bytes
SHA-256: a230a61d11bb221b7de6bc92bb0d24531ab277cb2455881ba1963bed1a35bf5f