Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ff0a05250ea4e4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 22:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c6fa9338ff5d07ce2063cb1fe076517 SHA-1: acbd8faeb6cece9c6e6d31ef79e7556cc10e66e0 SHA-256: 49ff0a05250ea4e49e7b05b3a0509e1f582f64aeff0d517e7e69761daf833809
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and ClamAV, indicating a phishing and potential trojan threat. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser extension or update. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to compromise the user's system or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sten.kr/club/data/userfiles/file/20210826141926.pdf In PDF document text
    • http://nepalbestcargo.com/userfiles/file/18838255301.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/tuforipewisejota.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b03b250fa41---nalemotofexiwiza.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/61280480958.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/78393029858.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5fb9d2d32123926c3331fd90d6a600a5/86355056352.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/94629908057.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/60045051794.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/buxijidazofekuxaji.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/64858820585.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/76035506328.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8c07d49f20fad39b78681588b7307692/84796687125.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2e7861ed---79621295112.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tf2lk5mbmm9q20jq3uv606tis1/79547597809.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dd0109c73b1df95c03b6cfef9651babc/bufodinitositabipibi.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/208619f750ed8d2a0130aed0568774ec/11891077941.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/48780503017.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210701_143436.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/o09isrv6hepqq04skk6qhq0qrr/51647010542.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/27933140969.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/42089424838.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/45327607916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=catecismo+cat%C3%B3lico+explicado+pdfPDF 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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 10848 bytes
SHA-256: 706063fda9bd776c2c5f16023e0e01ec6bcc00bac5996b58a51fbb5f403423e0
font_02_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 17812 bytes
SHA-256: 71f4ce493b96bba24d82446556e14ba325ba7f60edd32aca98bbb1bbfde637de

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