Malicious PDF — malware analysis report

Static analysis result for SHA-256 02691af4bc21b17c…

MALICIOUS

PDF

85.7 KB Created: 2021-07-31 16:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aaadc18e249a777352311767d6f27b54 SHA-1: 217d3d2afa7285d144331722c2676ca71b0d2b70 SHA-256: 02691af4bc21b17ca82f2bbb0ed1907c44238e12fe50aac8e7ed12d57f4d8ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://przedszkolenisko.pl/userfiles/file/62149271970.pdf In PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/depababovo.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/1610760921.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607789c9eec67---jabonasinudidoselupofivi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/71eb1054c378ff660f2e024f42cfe248/lusiwapiref.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cbb566d15---takavasotinulapabel.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e5563eb5259---75653448649.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/gopaw.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210620090819.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/bosezinufutoj.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c665ffbffc3---643038521.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/46894673149.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5f1efoqqlva5peoovcetrg7s2/24508657330.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/kikinabulakuzu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7cc6410e36ccafc00df496a7a64efea0/litefejejabewexaman.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/91711326186.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f51ead1b1ae4b8c70ffd596170a01236/taporobizevosabobusugeje.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/riwapozufifexelozow.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/ramujivedafesero.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/94937527870.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0714078fc---bexokawigeriteba.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/entrgb232emhsj4hfqa3u1gjs2/warakoninififilo.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/78913539999.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/titasosikasidadavow.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/41668396167.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/82510719366.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p89c78j638mp1keeubvpmuvtkp/46906958610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convertir+centigrados+a+fahrenheit+excelPDF 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 10952 bytes
SHA-256: cadcdce46744cb3dcf7ad3fe503730fda6bf132bdc54ace61920430a3fe33acf
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 17852 bytes
SHA-256: 508129534cb2ea8171a9c97e7211cf58916a2686ce12eeee9a022a7b7c76f213

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