Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf40086b09bfc2d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 14:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1334e5227b73580132f69fd81d0aafa6 SHA-1: ef9901e09c11ec62678e97e3e74c5d4d8a805a83 SHA-256: caf40086b09bfc2d02b11bee3118bfb0e7072fb481129c026e908ffcc40b842f
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is intended to deceive users about financial transactions, a common phishing tactic. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://viorina-deko.com/images/file/medaxajokokekaw.pdf In PDF document text
    • http://hani-bee.com/userfiles/files/semigeralesabolizor.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/86632376535.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/vilidusoratovukegex.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/88414567158.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/62789700574.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/datowuwuxitetasufagaso.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/13430901389.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb92053a94---litekemivugipapexi.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/72662998785.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/78068483057.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/1847945285.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/rorijugesaroredubomobu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/buxomosatuwinuwexivimag.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/63703f123bd954f6abc281af54a48bf0/bukozudebutudaxagubumitov.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/sigonebogiwupar.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/vevesomojomer.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/guzirefeg.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/34603146209.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/92e3edd4ef277cfb92c36aa65045f82d/kivubofumozosunexigonibeb.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/64183307323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=companion+fifa+20+apkPDF 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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 18828 bytes
SHA-256: 4fb235fc60de543df1aa1e43c936095dce6c52604e03731ba4036a451e88e295
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 10340 bytes
SHA-256: 82148d618fe99728a345b9c735f5f0be4d30a4f6b8c74843b71a4c3f2ff0b06e
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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