Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb0a94916d209fa…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 17:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 751b3d0f8ac2c45c9b49ccebe2626f7b SHA-1: 456821751090c4d436ffa01043266982f46b026f SHA-256: 2cb0a94916d209fa3ab33c33d3ee0b89cf0defc9142477bb050fa4b6d30a2b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a distribution mechanism for malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076d980d481e---rifud.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3c7d187256a3120f84ccbb6e7b0d457b/gotojibobusef.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sigumopuf.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d8b86b35c4c405b17c39b9f2aef3d9db/77203498854.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/8394002937.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/v300q0t5htrrtm8upku6e4iso0/28242302258.pdfIn PDF document text
    • https://manenshop.com/upload/files/sobuvatulufanemugususobu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qqop138rpter02hqi4rfiuf0oi/juduwigorunugezas.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/29866913797.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/as7mn1ghi11dolevt7fge0uba0/66022288010.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/lunezezovasige.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd26f43a49---21745170060.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/bijageliwi.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdc4c4fb2b---walegem.pdfIn PDF document text
    • https://ka-base.no/images_content/file/74419444828.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772fe3ebfd0---21370850971.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27ee1da8b---76140244535.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609689169cd6c---fagaluguterovonepa.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sifasokivedope.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/df694bgr2qfgqlce3qlgp9k1dn/vuwabopetokewofedaru.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/funulozowexumomenuxijif.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c110755a2---52213436535.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jsb4u6a6nmge2u4i80ieql3g83/73210037841.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/84089331141a92bc8f42fa95556a046c/72176583096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=getting+things+done+synonymPDF 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_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 17608 bytes
SHA-256: ce2966a259bf5787c9c857ff784e2dc4f2f1b368c72ac5f7792df7db23f2ebac
font_01_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 10540 bytes
SHA-256: 8a3c4df768427c9e8cfc0ac16364312c51b91a10914387d639f557edd5707279
font_02_sfnt_off00013348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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