Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42781dc8dce895c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 14:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b48f0fe3cba2e1d099d053efacfdc674 SHA-1: e9c68d1370138c3d04418c0d9f3fc5df655110ee SHA-256: a42781dc8dce895c38a9a2d460624e7f72eec5ce7d87695867371bd90bdba932
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=ielts+opinion+essay+samples+pdf PDF link annotation
    • https://gastriklandsbf.se/UserFiles/files/nimikigit.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/wusosileg.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d0a7f7e51df820b275ee6510d447c430/mijudelatejozijivokiw.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b902d586873a1b4bb30fdb47b9a0c6f6/50782983981.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/93449108321.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d6ba405fab897e513c1eefda7bae0687/jutazutusilog.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/13795097710.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f15bfd22---11251741879.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/cc65fd06f6cefb85c5265277bfacd8a3/zuvawofi.pdfIn PDF document text
    • http://rayanchem.com/d/files/vegotuwasimovinoxekopuros.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/rixikifuw.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tibofux.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/75921426249.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/98561351452.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/gibevisudididogazow.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/85102a625abf8647cdfb4062530128ba/wapijapozipi.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/40536473622.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/24979007883.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d208f9aa36---81744996388.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/55799938733.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/sukikegosujozoxakuxejusad.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/9852259344.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mologuvineluwebefatoxulef.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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 16860 bytes
SHA-256: 0310be7eaa0f21a64db88d0c6652a8453d6874f01e0efd1beedb77dfa66b2bd5
font_02_sfnt_off00011ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE1 10624 bytes
SHA-256: 5981887b5e9015ae78a72cb68b66875a68516b7d17d1384051e45fae18a47b0d

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