Malicious PDF — malware analysis report

Static analysis result for SHA-256 340a559d663edf6b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 11:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 945d24f1621bf2b9051a7b877ea6258f SHA-1: cea0feffa54cf8130fe756146fba659dfccdec4e SHA-256: 340a559d663edf6b0a3a55742bc16e5f5ab931aa1853fb6d81e9f1cf35846bbd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a visual download button further supports a lure-based attack. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=watch+now+and+later+2009+online+free PDF link annotation
    • http://nhatngungoisaoxanh.com/upload/files/sazamago.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613613000aec5---marumunuligavukalebo.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/61450010392.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/24927602530.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/wosikufotujunuj.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/larosipijuxonodupera.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/39226187980.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/98322130964.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/watuxunopuwipifaroped.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d806d240---467855726.pdfIn PDF document text
    • https://oasis-travel.ro/files/wetipuwenilimelebava.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/35985427914.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zolobopus.pdfIn PDF document text
    • https://grandegroup.net/files/voledefaguzewilaxu.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/figeniretulovelimolixowa.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/felazizi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gimn8qo1cm8e4vguiinfvkphhn/55390469968.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/27341352705.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/45711073061.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kozumoj.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210909_152516BFDCFB3816.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///surakaxabudufonuja.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/wolixulerukoz.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/94591801981.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/bowubaxigizeradokizo.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_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 10892 bytes
SHA-256: 002370df7d8be2f722950f572602865a1cd000589172c4f2ec2f30e7b4712c4f
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 18964 bytes
SHA-256: 173b5c72c25c6a963c19461b2430e31b81c2114b296c57808f2e178b1a09fe42
font_02_sfnt_off00012e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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