Malicious PDF — malware analysis report

Static analysis result for SHA-256 144b456e15fa0998…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 16:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b64e06cf7c46d99cb61e120736b9b409 SHA-1: e66df57fe6c259e5e3808afd6b5a50d3192f78c5 SHA-256: 144b456e15fa099821f5d022ec4f72a42602460fbd34507f309aad5a8d2ef143
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. The embedded JavaScript likely serves to further the malicious objective, potentially by redirecting the user or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://olgunbey.com/upload/ckfinder/files/76307289114.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/78405987956.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/57546477318.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/44353625600.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/tuwetoj.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4f0caf1bb0b8e57f8c41443993f36c6a/daputemokidoremokitagebap.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/60521463271.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/93288166271.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd8da8dc9e---wipenurezidofuradipizop.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/677e2c867d6ce7ce709f26a25abf71a4/libelute.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116186f273a3---92800949862.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/95792688576.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/gemilebewupopoxidezonosa.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/40040952634.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ud53d6a2tl0rcbtk4niov1c16i/guvarovenaga.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/wapiwogavosofuwafojip.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/poxuxuralapipapebuvujab.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/sasuwavuwowepowaguvan.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/kusepesubibegelejiwiz.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/9477787506.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/99357162236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=computer+communication+devices+pdfPDF 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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 14856 bytes
SHA-256: d293bf4eaa0714735f783a9f020bf108e95c9dc3da117cfde49d5382ff0300ee
font_01_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 10932 bytes
SHA-256: 02e9a218f4fe06448e28a0332220621bbebe94bc6b6d279f2878d25d815c54fa
font_02_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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