Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55ec2b74266ffd9…

MALICIOUS

PDF

90.5 KB Created: 2021-07-04 01:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 12287f92b68fa69f72f1c9b023999b57 SHA-1: ec7e372a6971a53cf627ee6cab37175970de61ac SHA-256: c55ec2b74266ffd91688b8d9f97fdcfcbc0bda939a434ca16e5eb5510090c7c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate it's likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://meta-min.com/files/63936463097.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098b270bde8b---kawufimusole.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/2630035437.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/61589279054.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2767dcd9560f70dd04a4c97451d70be7/92097220976.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de7094bccc4---pajugezin.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/77253325443.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/baxejesofininiragajive.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/17680074968.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt43uv0ft5goqa6dil7l2e6t1v/86122610072.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/65639593989.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b609ca95b---89057043366.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/70077904486.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7e8e5e60---53333600307.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/bk70tn3pg54t5vqpscpcl4rcdj/88109857378.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107040255475880.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/52748890465.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/dd03e2c54525a3625d56b500fbcc43c6/84458062769.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/zifubumar.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eac400b82---67709877435.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428210718485931.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/knvsvqi0t4irginerqidi3skt6/22153089634.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/59037743065.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/fadebemawu.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/71992769138.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61f568b82---dimolokapupebezeratar.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/17039083483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=new+russell+crowe+movie+unhingedPDF 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_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10788 bytes
SHA-256: 671776d3412e0e05f1eaf94a3754b86f673c085a6c46c644cfec315b8692ffc3
font_01_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 18020 bytes
SHA-256: 6925963f8af2bf7227b6980b73aa5a418b14c4236338235fd7e79bff881e5f48
font_02_sfnt_off00014436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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