Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb97c00e2eec6258…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 21:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac7e1ad919fa7820960cf62b8676870d SHA-1: d9cdf984bcf1ef7473ea201d0e6474b4492fe043 SHA-256: bb97c00e2eec6258fde07de2e10c89a8088b84f75775cf0f14a1db4666a37593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, which likely serve as redirects to further malicious content. The presence of multiple external URIs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://oniceh.ru/uplcv?utm_term=the+drover%27s+wife+story+pdf PDF link annotation
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/safalumujamipuburunoguvew.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tth6vudcrrv5spqscjlkp8gv9l/kimuzim.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add59d9cfb9---53517934702.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921a977c100---3445521623.pdfIn PDF document text
    • http://coffee33.ru/archive/file/panoxobodafutemebur.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8de7158fb---49356227694.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/47924228709.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fenifozaza.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d4e444d2oe6q9ofbgf1ildc67a/94582096809.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f607bae60ef---dewiparuwiwovi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddf3f3f51---besowokogipogamugudulirif.pdfIn PDF document text
    • https://combrooncom.com/contents/files/kakovajetogutazuta.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/67020778700.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/viwonukubuj.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aed0779c70a---30054859360.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/80550068435.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0d06dcaa68045a8e0c6d8f7624c8d75f/66235531660.pdfIn PDF document text
    • http://effektfilm.de/files/file/mebovibagod.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e12660a5cb3ff87eb79af95c964f10f2/89447859980.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29e87b663---nizabodepoxafok.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1629347642.pdfIn PDF document text
    • 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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 18148 bytes
SHA-256: 725518e9c6b5764f7ddd62f7d8f79482edb85cc7fe2367dd9131f640c2c11f5f
font_01_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 10544 bytes
SHA-256: 3562fa5228a2f2650fa755e6e09b4b1db26373bcb70cf899e99c849970078a5e

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