Malicious PDF — malware analysis report

Static analysis result for SHA-256 513cb224fbf06ae6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 18:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8c286418fc685aa8a56ce2dc21d58c0 SHA-1: 7d6abc9f9953e7bc8398c55bc379b3faf2a4726f SHA-256: 513cb224fbf06ae64f6030cf6eb9d038719240a144a4312bd895ff20e29d3169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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 http://finalbrand.cz/upload/file/90925069358.pdf In PDF document text
    • http://flemingdecal.com/uploads/assets/file/10410772270.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/86666487085.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/55893366277.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bce61677---74340880008.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifibokosuxitudizoka.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/wasuxaxete.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/38850098075.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/sogigugudozilinitajezi.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/51026951574.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/saviwer.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/25542844033.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/12098990097.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/vovux.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/febewewatikuxexanafavele.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/pedipifadexuko.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/rapemixajamu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f42b83f390acab369afb53d20134f450/tekadupojudi.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109181551343957.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/kewesusojuwikekavelor.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/vuwefaluzapiguwud.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sumofevisisizeremedaro.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed369eb4f7---degasovo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f6fe83f70e0ac27326c949946be78637/27899094908.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441fd8d3ed5---logepixepeka.pdfIn PDF document text
    • http://djapm.com/userfiles/file/jukolune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=video+recorder+app+apkPDF 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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 10152 bytes
SHA-256: cef61bf8e9bc9259d5151f9c48fc3681ab837b4604ae091214cae35fc317b72b
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 16804 bytes
SHA-256: 7d526cb0ea1d5c8262ef568abd8c584c30253ff187973fdfec40f8470c79c472
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1