Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec4eb4bbdbcd017…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 18:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f5090058e60f47a9e9258f979636736 SHA-1: 2592bff0529ba4538cece4308a1bc5f9fa69fe0a SHA-256: 2ec4eb4bbdbcd017771b71b6aa3e9b2666f9e5a759b99f02dd6f5e0f27758372
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. These links are likely intended to lure users to malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://trendybiz.in/usersfiles/file/komemejojokodukevoxibi.pdf In PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/47721246807.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/fukopizutopajo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/nanumosi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609486849125f---18692223271.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c455cc1b9ee---68926216668.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/numexagidi.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/74413378229.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4672261e1---24146275927.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/41254f9d01910307c4d30901535b43f9/16651853539.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f6a97e385b738ae6f89fd20458dc5d92/5703546019.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/rewakitamuxidumigezav.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9be98a55a0d737961e545c48db054046/sixikugekusep.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/sf7og8buat00ud84fam36o1scn/nakubidubinijedub.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/tabonabujewewupodunek.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098503553de6---nadufogufuvarix.pdfIn PDF document text
    • http://grimastone.ru/files/19553314904.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/36073887699.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///90399541797.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8e3ca2c1---kigitebivovoz.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/13746867708.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wezizabesejunepawuvebiri.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/31964536325.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b9b1eb38f4b69c27cc4c4428b49ed2a0/46155722064.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/palijexanakeluwolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dbms+faqs+with+answers+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_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 18292 bytes
SHA-256: f7ba7bc52d1818f0909fcae5bcbd46876a649c18a8cba4da26d80cec2942bc24
font_02_sfnt_off00013b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B73 10972 bytes
SHA-256: 50b43bc3f87613406947b8f63e3eac27dc8789253e3f6b79ebe66f87f215e972

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