Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67abd7dbf8598a9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 08:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6ea19e7156998aecace31ed6f2a5b4e SHA-1: 331547e51c9da27260923eeb4e18aca6120df925 SHA-256: b67abd7dbf8598a900e52b7c67d35c06529174b6131b07c3f5629d44055ce4ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://makinsushi.com/uploads/files/kesorasatutukapetuzof.pdf In PDF document text
    • https://lanegarrett.net/userfiles/file/26093709001.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/28368043010.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e3p5dlph54kglkelhmppprfh15/43331852859.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/97370643366.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xisalapetopokugonozelugi.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/80394135478.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/bigux.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/92524979364.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/22564484943.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/zojolatirura.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/72c4da4bd0531ee41b88c2de447b2c39/47502829889.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/jenibakomavefaj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085088a7b683---24453772222.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f38422b135c1fdd87313588e896f1f5d/94559649259.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/26062013800.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/m869dbgkafhgu1i1kh34msin39/7722950493.pdfIn PDF document text
    • https://mmszke.hu/files/file/taluzaseladatazoxipip.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef2a2f7c435db96cf467c5673f81703f/54109391554.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/geban.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/58107186034.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/67194043378.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/58173639232.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0444a54e42---26521175491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=invitation+letter+for+party+to+friendPDF 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_off0000c0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D8 10456 bytes
SHA-256: 4e1e1cd9969fb71d85dfc60cb8c253bed7adff93275a697307d018c63755fd0f
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 15300 bytes
SHA-256: 7ee6d6ffd4e9a81706976b9381429f1d2d1990a12dcdba2cd02dcfd934975075
font_02_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1