Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbef8c70aabab16…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 00:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4332430b9d100d8fb1fac584bc6440a SHA-1: 66cdfc380cfa0e6ac7a2f9c02b3e9fee99bf3cd2 SHA-256: dcbef8c70aabab16a766b1c53c118e6de6763afbeb61f1565f681ea860d353b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including one identified as a compromised CMS upload, and another on disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pt2-turbo-j3t.com/contents//files/xesuvekanimaxapowek.pdf In PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/31359994580.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/gusuten.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/94285404316.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/64272535660.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e4819b504---lemevuw.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/nupaxume.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2f7a108aa8e4c57edb345d48a7dbde6c/65633654726.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/dupexusolopu.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/81602008147.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/61197685188.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843b45c15c---buxaregavilafawedu.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/47085785081.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dawimeg.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a999a6d0661---lipudavazap.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j8r51vogd4d3cqtm2p1vsnglc6/dozowipelesusomo.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/sifume.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4b13efcc97233b2b152a67a4cdbb7254/35580449984.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/64274314999.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/movubofijuganaxun.pdfIn PDF document text
    • http://apcmagon.com/userfiles/59277763013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=york+yk+chiller+operation+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dcb35bbb3---84854886898.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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 10760 bytes
SHA-256: aaeae9d6e17e2b112d855cbbf7ca7bc0b0bd1b7678de6d52133b3d4103a4c4fe
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 17048 bytes
SHA-256: 7afac71dbc558c6b612f9c99fa55638826ee9f556938ef6a8b36579d0c2b506a

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