Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c17bd11f81a7c72…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 10:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8752274077ce0c02bca3a864e9f251ff SHA-1: 89838e300a695feca457f85b9007e295d1fe7a7a SHA-256: 4c17bd11f81a7c7242a28e0791f849e50210a5444c8f98f23d522cbf6d5b3fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/uplcv?utm_term=enzyme+defect+in+galactosemia PDF link annotation
    • https://sarvodayasamaj.uk/upload/files/71571875869.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/tarotuvar.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607791ae825e6---xapewemirodimab.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/verewifir.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8cc53a8aa578404f82a2d5d62b781842/kuvoneledujelojikinij.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/tobetutojewokif.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba48d9e7f---51719817827.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/4c3983bec7b75c2423f1a0a0894c4fa1/riwiketusojorujipigo.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/nufemomotetumorema.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a2554a65fe---rojisapagiborolajibirugop.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/xugabobade.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f67419816bdf7f903421e1c081b6249e/64606914997.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fec00f453---jivupowigisakusimukixas.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/nisixekupu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8f9a259da---lomutipalil.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/jepopomuxegit.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dec8df49b050178d806adc8323216f7c/95461101766.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r800plchplediqevt1tdrh6icd/zesizowexiwevogubovaroto.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6294ce3e781c68cf2afb92be81ad5b3b/lagisujuledovebinepegovo.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/pigopixunidonixivovujeres.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_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 10876 bytes
SHA-256: 29af82cc23da9c606e5ecabde741f8cd81d1a59a157428278cd3a95b03cca392
font_01_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 17296 bytes
SHA-256: e8057eccdb64f94bc5278a61a9cc03bf28636196464d55deef122df2b6ab0877
font_02_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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