Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7698554e6dfd46…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 19:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84d03ac105d7b296b410bcf484fbe2a0 SHA-1: 26147ab32ae61c621c96722ec8b58a0f7f36900d SHA-256: bd7698554e6dfd46fe623806b98ecfa4d84eed13f6a6c48924d0ca301b125f72
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • 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://dammesliepas.lv/ckfinder/userfiles/files/wajiveturegebidimibegig.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136d43dbe20b---vatejefif.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/34038002913.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/tewufuwimomogajafowu.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/24675712595.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nunigezunase.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a6a2f632265c256ec00061bb0afa9907/vujakorajewopuzivijeb.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/forewazap.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/30829018488.pdfIn PDF document text
    • https://33mobility.net/uploads/files/29535167547.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/7320813262.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/niraxuximawumejeborad.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/nasit.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/dubukevegixenulefik.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/706034ab48263ab55e12b8e1f4fbd490/97091540173.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/vujudozoruvenowesavesuge.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/rixelufoso.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/24381312643.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/46591959366.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/8784949244.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/tekop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+dream+league+2019+downloadPDF link annotation
    • 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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10884 bytes
SHA-256: 92c3d38a70fed66bd94a70ff9ebf66caf4582d1b6e192d765c2549f0d14f1855
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 17852 bytes
SHA-256: 1d6fb34e4ca6b5d3f851c73551418b1b5f189f7ad75a4bbcab00df5a0286bcc8
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1