Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d987d53910e5b8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 20:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 028c5105f000a225f86854511a2f253d SHA-1: af9e2bc60990956f088174871781d41017b8349a SHA-256: 19d987d53910e5b8f7e5c11b2eca7439c53461010cde55911f98627f790fb598
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=what+can+you+do+with+a+ender+dragon+egg PDF link annotation
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/sofidolelosudi.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/xigotopugivorasufomurisa.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/falaregujukikevexa.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/69816866974.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/38983674361.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/94281822931.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/91262524979.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/zukininibodexomadegaguxip.pdfIn PDF document text
    • http://www.pvvc.cz/files/femawoxogasasobozofotemu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0bc4ee3199abe395b52316943c4e08f9/bifudulujepu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/suronewifajotusos.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/jizikadovajuzapovofoda.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/delumoxaxuzagizek.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/95482328085.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/34243702186.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba74b619e---74528033042.pdfIn PDF document text
    • http://gestioniarmatoriali.it/mamuregatete.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/16792776485.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/nadogipotobesedefovala.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/zoxurakina.pdfIn PDF document text
    • https://music-group-store.com/upload/files/39290644402.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/rupitadote.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3iltp0ffe684t5vp4evqnmnfq2/tipetakevovo.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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 18072 bytes
SHA-256: 8b7097bb3957ebc8f795a294ac226b1ecbb042a8be25a3e70d633bc918d7a5d8
font_01_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 10728 bytes
SHA-256: 0427d1f168de0f0716baf3f0acf2cdfab657ecc213cb11d86f3d926555b29081
font_02_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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