Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad7c81b909fbebd…

MALICIOUS

PDF

70.3 KB Created: 2021-07-07 02:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73d06fb978a6b64f793231e665862129 SHA-1: 13d8d9ccb0c119af0430563ef6e04f0bcab66940 SHA-256: 8ad7c81b909fbebd7a240704b8cb5de5709374d88ef688fdda9a12c075610e92
154 Risk Score

Malware Insights

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

The sample is a PDF document detected by ClamAV as a phishing trojan. It contains numerous links, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious, reinforcing the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

Heuristics 5

  • 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
  • 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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fdp2g73gmkr6funen7evcag77e/54622272171.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae45e01828---4631825079.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/73620961714.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e3cea25b---rukenadafifes.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/55f61f47d002ba25ca22e50a40f03aec/nivekazogumemolej.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/k45sivppm7qck0qjg657i8bmbl/guwazasidotanoxamex.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/6ed40fd9e1aff3f6bd2e6d62b855b1be/nirujojubuwevewupen.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/65538794129.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5a57cab7---43346238570.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779581dc39---towewoxomekokuporelofu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d18e32054a64b9a7232caa9f8f734965/40613037449.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f41ab58d2---jubedoje.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6529ac372---18872059047.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f8d5454e8d90dcc8b6b5b8c2e97c04bb/72193695235.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609224835a28b---28729326101.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3eb073da2---52054925883.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cdbd802ff45f49f76750a39b1c2987e1/73116971054.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e228d9641---66685895287.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2i0ed93c56n95isnamsbt0tsi0/17886619232.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/suxokikakulimufejilonasu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086241bda0a7---jugowuviga.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fe2522da---zesidulesenal.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/68752363154.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b5730b72173---82433011204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=excel+physical+therapyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1