Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd90bb757779c0c9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 22:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fccb7303bcf55917d77d82800029efbc SHA-1: 605d0d73ef6f1b76760300b87a212b4aeed77690 SHA-256: bd90bb757779c0c9b5c6bb6d3ec0c25090cc20d5ee7b5f9b241daf50d03d91b6
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those pointing to compromised WordPress sites and potentially disposable hosting, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=film+desire+2011+full+movie PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d922595b31---57244857948.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/2313587207.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/pewaje.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/puwugonifatefodenefu.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/paluwovenuw.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/bopatakiva.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sirukexibababeb.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109150647049788.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/pafibikuzofiw.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/85007024127.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/niwufarakevokaxosopuvik.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/bapukoko.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/kiwefusuduwu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/marepudujefavi.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/dezefene.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210904031500.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38860130996.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e14131c7---newugamelusaxon.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130603b88986---zusubariz.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/tenosater.pdfIn PDF document text
    • http://osayit.com/images/file/13091779198.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/sexivodunenosaxerikoz.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e06c14e0---78926743959.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/nuxixom.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_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 16596 bytes
SHA-256: 05f731552421953128a19d8be3ea271de213ec5f7ab008c14980599cdc74d019
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 10588 bytes
SHA-256: 2135d172ac6a04b59ff291d732d4736af5333c17a7db441dcbbb3a788cbc25f3
font_02_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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