Malicious PDF — malware analysis report

Static analysis result for SHA-256 835b903e620c1d7d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 05:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8386eaa4416eba25fd27bee0d20a0c8 SHA-1: 4571321ce13698ef7c5fcabada257da457b20300 SHA-256: 835b903e620c1d7d5b03f01b74093c0dcbe79439e91f8d17b108f32301b7fc4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the heuristic firings clearly indicate the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0efa8da35c409a50bb9f579485a9a99e/rinosesadufebo.pdf In PDF document text
    • https://zabulgaria.org/userfiles/file/tajuwebudofamudifufi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c6ebdda9f7e5a157a6d339f5ad275d57/wuxetibaduxojiruzamekunes.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/64506638679.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/lasisijivifutilaba.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/xijudupuxokodexoro.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sulurozavudewaloxikan.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/tvd2rc41rg0vfgt2g929b6qbg7/melubelovedemilalemases.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb5fe50351---78111089312.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/83888293611.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/gedaguzegixoxidafofagi.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/sutezokejiziz.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/jetegani.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/wiloguturasegob.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210903235022.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/77612654958.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/96444080301.pdfIn PDF document text
    • http://identik.hu/editor_up/33829763658.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f819791ca8---99957165346.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://eliteplacementagency.com/uploads/files/xatalen.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/jizisalazevavemoxu.pdfIn PDF document text
    • http://arablift.net/userfiles/file/pazixojuz.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/60492453008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=photo+maker+apkPDF 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_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 18612 bytes
SHA-256: 8e7f85d21a732e837cc3270e850b9ec295b1462283a73c0c2fa19092497b27f2
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10200 bytes
SHA-256: 206a2346e035a85230246bb447722e1e2fa08990673ce6b14599f8b63b358041
font_02_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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