Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf107b514039520…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 11:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 696f85153c995f3733d6596de17917a4 SHA-1: 82662aa4832f919d340dc204257da3d6b20b250b SHA-256: 2bf107b5140395206f53f2b31da60ba24ff44c90bc63de81d97776cf8536a553
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=how+to+download+videos+from+chrome+on+android PDF link annotation
    • http://kristiankutschera.de/userfiles/file/22250033025.pdfIn PDF document text
    • http://domario.ru/userfiles/file/71416810400.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mndn415heggpa9q9oft8vqb2c2/fawivujoketikunama.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/toxuvazo.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/2123323451.pdfIn PDF document text
    • http://falconltd.pl/cache/file/gugetirajumewegejini.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/46748534191.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/winilalitosagevexuzapo.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/87643539638.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/mirugisinijawuxabesemewev.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eb5394472abedd84875fa140cbaa2f30/puzakonabunezuzoraxus.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/pazimutegujopinef.pdfIn PDF document text
    • https://777mto.info/contents/files/48633695850.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/72663069635.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/49558116135.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/peliridamifinusokaro.pdfIn PDF document text
    • http://iknow.pl/files/file/kejarawuzumep.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd2016348---5839363862.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/xiviwozil.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301393f3383---ramanavuzeniwosum.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/fubunanonepuxegumogelajo.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/82630020599.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109121442442321.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/66197870515.pdfIn PDF document text
    • http://lawngo.net/fckfiles/nuzis.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/mobez.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_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 16424 bytes
SHA-256: 9e9b1c7f0f883919c3f2022511a3110b463c983ecf0a2b73b79c1468ac7c39cb
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 10884 bytes
SHA-256: 620bb25bc74918176aa970a63936d4bc3c2901ecd0ddeda013994f31e35ce923
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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