Malicious PDF — malware analysis report

Static analysis result for SHA-256 b484876d6d909dea…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 15:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25a4c22e52e1ba15e0553956d71fbfbd SHA-1: 3d22b75d2af326fe08d6643f72d2605b72cc20bc SHA-256: b484876d6d909deafa31a6b9bbc191a95c95e391a8dbe9f2ff2f5561115c08e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=take+a+photo+from+a+video+android PDF link annotation
    • http://codienlanhminhquang.com/upload/files/45527114874.pdfIn PDF document text
    • https://beaszemin.com/files/fabibifaxewogazif.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/togedi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/ralipubidegunazufivepap.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/tedusutimivabememom.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/tojotuj.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/robediwukuretogaritalu.pdfIn PDF document text
    • http://schokobrunnen.com/idata/munero.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/sugamajusinuzixaz.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312ab2a15fd---24435853484.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/mazamixemawitutekulunax.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-12/4d0e18b23f545ef98e5a235751629a77.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/1605328772.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/wuxomajevatadekizavutox.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210905_314EBAA90E9C4761.pdfIn PDF document text
    • http://netart.hu/userfiles/file/17978718603.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/vemunef.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/82990711843.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/sabuwemumutugadepixuvenik.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sesekoramebiwazumapefozox.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/md23hjvstmg4uk26lg23bb1kl9/71690880373.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5982f606---55280952755.pdfIn PDF document text
    • http://tipiland.net/upload/file/3248606743.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_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 17380 bytes
SHA-256: 21d00917fbd843d487ea61a737fbd8fbe0263777417bf56f813054644ecfc489
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 10668 bytes
SHA-256: 5dc8eb6f742fa2d07790e572dd8722699c2be899524996c56e60c6f943e14dab
font_02_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1