Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f749ac9d276b21…

MALICIOUS

PDF

82.6 KB Created: 2021-07-21 02:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 54e131179b986b7afec3139e8abb6a84 SHA-1: b78383d851a5e46d9555a1442bb7d7030953d962 SHA-256: b0f749ac9d276b21406c8b4afbb3fab14925cc2e4762c6a011cd0c3e1af18839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aduanaldelvalle.com/userfiles/file/kopatajevagot.pdf In PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/fexusi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/srctng0nld9e4f21bq7j69r0r9/jekuvamajapoboxifizuruv.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/20993728257.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06bb0daa49---20278473231.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7950ecd6df0a71f6634f79af04d70488/tusibepirofazekuko.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160947dd8dba8a---68077400365.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb7d447e9---muxufajuduvowixudo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089534324060---80956220286.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/87561748699.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/kejitapobaxovepemuliri.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/86tp541gepnalg0ci8muhjbsb0/90991495328.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/1973074102.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/44210391279.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160877ba3e4daf---kebapulupetus.pdfIn PDF document text
    • http://teplospectr.ru/images/files/wubapewotakofovemawis.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2c78f41b---16812161342.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/vinerasar.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/denafufawikinaminadupeg.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/vatebokolakem.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/57224901267.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-30-00-59-58-80.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/88528586450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+convert+presentation+to+pdfPDF 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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 16804 bytes
SHA-256: 2cdbca4db02b011e47ac0a5a2d8324c9f0db1a224b886fe6b5d641648c2cca00
font_02_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 10708 bytes
SHA-256: 8901c6a3b9b8e0ba8babb3b27973c760d506f411f416a9eb96edd739d2aea1d1

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