Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0b889082ec36bc…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 13:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a50fdf5524eed691e6c6ac03e5d24f0 SHA-1: 48c6a6a5055dfec55191cbd7e60e699be62e55d0 SHA-256: fb0b889082ec36bc9f4a60d358a93853286bca42a3835eab3eb1fae08ffae19e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://gamma-electronics-eg.com/userfiles/files/36107439570.pdf In PDF document text
    • http://aexpress.lv/index/images/up/file/93861313478.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/tinojajebowebewesaz.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/76548187344.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/mujumesibixed.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/wowebugowevogamosudipime.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/55820984271.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/67070047046.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/makowonojinixa.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/9773404154.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210904140615.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/usue8894pf7e2t3hkeleqvrbnh/17728359398.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/88109945458.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135117886e90---newudetizavanixizuti.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/xowalixopevekilusel.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382abf916fe---misuzafubadukojolojopa.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/55003109235.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/kazukukado.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c748e6e37---17721508868.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/16831171053.pdfIn PDF document text
    • https://computerzone.pk/file/47355841333.pdfIn PDF document text
    • https://kristinanamaste.eu/files/23391873296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tulsa+time+sheet+music+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_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 17788 bytes
SHA-256: 2c3bfb99bf87de71e6b4ee2aa129f24c420f95f36477da3b6764a7a986ea994e
font_02_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 10624 bytes
SHA-256: 7059dc5ccee5709bfa1a6143129765030acb13cd208968a1225cb7f23f181a41