Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd68c22dae5cd7b1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 03:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 73f37e3e699dcb0d738c0a88b6cce9af SHA-1: ec6d5859e11cd03d966175913b3fade5e1ef3070 SHA-256: fd68c22dae5cd7b1bbbf9628f9c2baf7ee35d13d347a78a276a377f208ecc7eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary intent appears to be directing users to potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://oniceh.ru/uplcv?utm_term=vishram+singh+head+and+neck+pdf PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7ich35m1resqfqk3vg0qsu6i5n/79126126155.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/26909846038.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161366e436ae98---29628608788.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/43272989916.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/venum.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/kizosimirutum.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/kezupajoki.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6b672552c4d7473298af7ab96bdb8b96/93300658559.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/23071346109.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1229b04fde111e73250056e6e4b5568f/28910787346.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/giwofirefewebix.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/dulera.pdfIn PDF document text
    • https://emmaushuis.org/pages/tagitupulobiboxi.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/kobotata.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/lefusesizasanaminurizix.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/lumurenib.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631235632.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/30655729259.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/56386397291.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/ruwekukawugitilifigolex.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3dccfa02a83400dcab9edbcce8d08a98/86767997421.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wuvoxetumaxetatamadug.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://metallpress.info/files/dagojolub.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/merupoxasejezo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 10864 bytes
SHA-256: c39da6dda404ad497fe516963a3f5d74f9f59c97b072aff71f9acaa7f9fc7f4d
font_02_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 15820 bytes
SHA-256: f6324f66a1971652364d20cb2834b79b2e747e8328a8ca038535e5f9932a6b86

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