Malicious PDF — malware analysis report

Static analysis result for SHA-256 616846813ee2c69d…

MALICIOUS

PDF

82.5 KB Created: 2021-06-27 23:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e26f5a30fa949f046f50347955631582 SHA-1: 257d8590b1526222493d702fe753a054d3175996 SHA-256: 616846813ee2c69d1a44c1cee7ea72fc375903094d25c0c7b4380ec8d53cdba1
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e7ae531e---sowagomawufuporu.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/mu6ajd8mj4aoqpq7dladuujij5/xedururidazubu.pdf
    • https://juvelyrikoscentras.lt/Files/file/29993440354.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/fateseravuxerumaj.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/dovinejilovoje.pdf
    • http://hud101.vn/webroot/img/posts/files/waweroxasekamon.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078665eca788---rofunabimikil.pdf
    • http://leakefamilyreunion.com/clients/63964/File/9212444070.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/v3518j3q7v89e598sl74t79k18/3574831819.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b74a8ab7---92194302780.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abad7f790b4---tibofezada.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/449bf01809b07e35e5e0cf9dfbb7ff14/5778853072.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1cfcc11efad0dd5eb7e87f1fa191a1dc/wuxitadomo.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6bab9661---14434434728.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088918013515---61841643346.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7faf162f---fexavigonelokamot.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a2f4c0ea---maxixekije.pdf
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/zafefusakibofomixis.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081894b4c585---pozolid.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/be8ef05461189e910a040cb3af809902/nitilizagagefedobano.pdf
    • http://maychamsocda.vn/images/userfiles/file/88561176826.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764ec24af2f---56353415784.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160880457b183b---82767183242.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=converting+pdf+to+word+free+software+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 16792 bytes
font_01_sfnt_off0000f625.bin
5af4da3b6769a49653806d1d85809db45ea03aee4fad7bea90d0e74bfe8f9188
pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 17240 bytes
font_02_sfnt_off00012368.bin
cc5ee927985c659d0bb5506f1d45f45576eaef94deda52245f661006b3319319
pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 10856 bytes