Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ee08ed7b606381…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 21:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 084f671ac9efb5d8beba4ce251cfb751 SHA-1: 161d010652d18c7f45111118d45fa5f24613b3ed SHA-256: c6ee08ed7b606381b9a457cf702cd57fd388fd0df4ab25a226ec23312e685f01
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple disposable hosting domains, some of which are compromised WordPress uploads. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://shen-su.eu/gfx/userfiles/files/17257046322.pdf In PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/19896457802.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/vejogadurifos.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/divifozakovu.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/88361450736.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/83002109936.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/misapamisonulojabukux.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/kawemipikukato.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/68428903346.pdfIn PDF document text
    • http://chenruichem.com/upload/files/14400631487.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5efd1a40e---18334065892.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/6447255065.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/mupeparoviwuzaju.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/ligubo.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/75991399985.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/rimebitetugexev.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149306982d52---30587045298.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/nujezaxikexuz.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/gatawuzowemidivaxamipipul.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/27314295856.pdfIn PDF document text
    • http://medi-sen.com/files/files/mimuzidofikavenusuti.pdfIn PDF document text
    • http://normel.org/files/upload/file/refukibuz.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_13_04_37_24_6422.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/toxafe.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/4387791099.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4fdj4ove0e5kkj9hoq0m969f92/pawubovugusamudoraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=atomic+size+of+arsenicPDF 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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 15388 bytes
SHA-256: 387da7f87dd14826532acf64589a524bbaff70d642e2cd5e0f455a49ab4d102d
font_01_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 10492 bytes
SHA-256: 72cd638a826ba39f3c6af84d68e600e68a4cc7b7e4279e3ffd01cc32d889100c
font_02_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1