Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f3a7ac7664aa3a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 00:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7d2a7a5c9f252ac74e7e5023242fbbb SHA-1: bae3721b17644b1f589627f93d0f5786c5547fa2 SHA-256: 74f3a7ac7664aa3a0b685171f72c0a68e7a630dd06d196e43026ad0b7175ecc9
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, some pointing to potentially compromised websites or raw IP addresses. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly indicates a social engineering attempt to trick the user into installing malicious software disguised as a browser update or extension. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://telek-trans.hu/editor_up/nosevefomobipenuxuviga.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9e0ace5bfad958a03e71b08a7d6cfadc/19694447715.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jisegij.pdfIn PDF document text
    • https://polytex.de/sites/default/files/55658752874.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/112199331.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614289297cd77---46593113300.pdfIn PDF document text
    • http://feminella.ro/upload/fck/webipekilin.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/3772433427.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/dakuzadunirutadevadawu.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/57963871363.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tusawajofim.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/zujalojuzuximukolex.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143f310a2843---dufasadatavifepugi.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_144728.pdfPDF link annotation
    • https://krainaogrodow.eu/zdjecia/fck/file/duwanuzefexudirikenifamed.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/92566679866.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404d1321c5---rilibajoji.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • https://irantruck.ir/data/file/94298438934.pdfIn PDF document text
    • http://perksys.com/userfiles/file/tutofarovuvuju.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161450259878cc---wodonovunomoxomepe.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/50751855844.pdfIn PDF document text
    • http://ukrfirework.com/images/file/86373596447.pdfIn PDF document text
    • https://ms02bet.com/contents/files/12650344584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nba+2k20+app+not+installedPDF 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_off0000c16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16E 10736 bytes
SHA-256: adbb5a0812852b1e8781c5edc5d728498721c054f69451826adf7d954aea9740
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 17072 bytes
SHA-256: 0dd20aa00846dc5812fed43dccd5387c01231ca2eea40040742e2709bc1cd3f9

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