Malicious PDF — malware analysis report

Static analysis result for SHA-256 87223380f798b6b4…

MALICIOUS

PDF

95.1 KB Created: 2021-09-09 06:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3a9ff66f52c332d272934a0202b6bd0 SHA-1: 0bf373a6d00f0d56637663a17708e07e34ca9f1d SHA-256: 87223380f798b6b4910c3c01c2aa70efd6ab318e53f28d91c8d1d5ac7809ce09
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts social engineering to prompt the user to install a browser extension or update. Several URLs extracted from the document point to potentially compromised or disposable hosting, suggesting a link farm used to distribute malicious content or redirect users. No scripts were extracted from this sample, but the overall pattern suggests it is designed to exploit user trust to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://liweisteel.co.th/ckfinder/userfiles/files/38005355232.pdf In PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/zegitufubawow.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/84254355746.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/83606723196.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139454c2c4be---10814613003.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/558d6c3733f25877da7c5f07a7296860/fisisosubagovef.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/28395485636.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/24727793263.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/12697029856.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/11661632771.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/kasevimuvunomuworemonizim.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2acbaf2e43e0091fa01361d74aa4264f/2018854168.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q1q28ldb9vsvuesp7ai1s4hoh6/17493039014.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/8522980426.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_030825_194.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/lijifewife.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/duxolivixifuzelobibi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357e35bba3---24633368117.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/24795524964.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/kegokowamurizixubenobet.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10419eacf---68161280620.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kapifenuvatekukafolazir.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/5626812171.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v53sltfaftl3lmr5n3b5jn9c1/32172374926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chrome+mobile+tabsPDF 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_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 18908 bytes
SHA-256: 70d3bb9895ad9dcbd284e36bc0e13909e1dfa9887172a3fa79b0e96a9b002377
font_01_sfnt_off00013f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2D 10440 bytes
SHA-256: 64060180eb30e09215766325a6de3cc5fb47bf30ff758211f1b411f0ece0725e
font_02_sfnt_off000156e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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