Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8607661886a74b…

MALICIOUS

PDF

90.6 KB Created: 2021-09-09 23:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9a1a214d3a2c07e01cc9f1959381ecdc SHA-1: b578468a0ff24b167a1f1c98cda8d2f601ffe146 SHA-256: 4b8607661886a74b8dadf5d78f902a96f65ad913923ca8eb73de8379c61b63d1
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://smidgel.ru/uplcv?utm_term=gay+flag+emoji+copy+and+paste PDF link annotation
    • https://groupunsur2.com/contents/files/jefomuzejelilu.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/tarerototomuzimuwoluxeku.pdfIn PDF document text
    • http://mlead.net/images/e/file/59733375937.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/zekubemob.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/siwewojolikoxojozudo.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/9897844099.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ce6c03056e85931b289bec3b2d6981eb/37057705736.pdfIn PDF document text
    • https://grnca.org/img/files/files/fatopekemitowopem.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902082304.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/lanim.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/navejunededifosurapefozu.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/zelalezatomanan.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/sunepife.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/835807a8d5c278f9d6fe9d4312c260dc/40806852016.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161379311c4949---vulidodewamewi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/18sj63ka2kfailkrdo7cqj0lk2/bubaxowelelopupelapovobod.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rifureruwuxif.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/gifigeburenega.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/36662182632.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/29774485905.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/gofeferutirisojakutute.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/18514790731.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/28678507855.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/21179050655.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/36111214236.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 11144 bytes
SHA-256: 96c9f1b0c173b004c81de58ea019d24714ddee9566cad02f3da8186b24d47d00
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 17040 bytes
SHA-256: c75dc12cbf287d439952ac9e37669091467f4c96823ac1e31c0821e8cfb2ecc7
font_02_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 20264 bytes
SHA-256: 08b662b8085fe2915354ab833df525462e8c3497a0622505bcabdc9be3690449
font_03_sfnt_off00014441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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