Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d7c9fd88ab5abd…

MALICIOUS

PDF

84.6 KB Created: 2021-07-08 19:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c975cb18c8d438c6674e05b44938a3c SHA-1: d19a875cbe307e16f5aed8330361bad348fd58d4 SHA-256: a7d7c9fd88ab5abd727d3a289c82ac7a6213baaaed88025e48e771cd1a277233
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing malicious browser extensions or updates. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, likely serve as part of this social engineering tactic to deliver a secondary payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c813a493fe---genokagobatotebuwu.pdf In PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/94351577793.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/34206297341.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a2424e28900683a799cba13b4dbcb122/balakixoxilu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s23k34bvruarfe9noe93v8sh6i/91967336203.pdfIn PDF document text
    • http://hasyo.net/files/file/42318092850.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d1bbdf6f---nemokunubozigikabizigave.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/92732125243.pdfIn PDF document text
    • http://acril.ru/ufiles/files/xarun.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/7664989437.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/8818416923.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/senuboxizuz.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/58132488488.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090770c2dac5---20283705957.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/felagusoga.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16090b243cb803---mataxamogodatonitovomomuf.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jofakexilikiwe.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kagonubuke.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/jelakiwafejag.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/gofevu.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d2706d85c7fb5b4eaaf5ba8e95ee6e3e/retizeku.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/71160498160.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c7ffaafc8a72f6b8d823911a008693a4/30927316575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=flashes+of+lightPDF 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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 17492 bytes
SHA-256: 888efd1d3c087f9ce713446b100f8e6def88c69441376ae59d1104809ea269b9
font_01_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 10264 bytes
SHA-256: 033f3ce60fc2b40568e5503470997397c9ff1663264fd3767aab0e5f97220162
font_02_sfnt_off00012d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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