Malicious PDF — malware analysis report

Static analysis result for SHA-256 255a47c1e43ebd5d…

MALICIOUS

PDF

79.6 KB Created: 2021-08-18 09:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7e3a2a3fee41b265cc5fdc47f9f914f SHA-1: f825552edfe225727d57da81c8fe5752f9f04b37 SHA-256: 255a47c1e43ebd5d94b4102ec0d49d13ed396534695fcbbd3c5d2c0d29567b73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary goal appears to be directing users to potentially malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://rklatex.com/userfiles/file/gilaxotixofageropu.pdf In PDF document text
    • https://aradmissions.com/ci/userfiles/files/lupugi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbefdd85201---rufiw.pdfIn PDF document text
    • http://rld-carbon.ru/file/bokagopituxivomute.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/piu8al7ksgup7o41730lgp7o82/42382080998.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/61493335865.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/34dddf835813ec6055accfd379560dc0/lagolipet.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/38dcf4d64967ceedebb852ef2952dd21/58184220643.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cd97b5e3740---garotozuwi.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/92852925388.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7ckl8bm2tivkurt5o1f33hdvo2/25729713888.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cb56d354b---kokepufuzodejudaj.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/61431963108.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/52f2318279388ae5ef845eb42827cc11/82247088662.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2llvlf5qtrng5kbetn5j7mfhjm/93054270320.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/kepuvezetidimorajesibe.pdfIn PDF document text
    • https://hirurgija.me//files/12480657897.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f166e165fb---54068797071.pdfIn PDF document text
    • http://risme.vn/files/46434563741.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/kolug.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6207d7b25---kesapozetuxedebokiwaxor.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084affa28679---66805580164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+peque%C3%B1a+historia+de+espa%C3%B1a+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_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 17160 bytes
SHA-256: 14c6e15745a8d342b4c9a3c5995a6ca4e723974484539f7b304b6276b303e767
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 11200 bytes
SHA-256: e743d73bb9420a64ad2fb4e9b768ff85c271f38e7b7dfe1b8988f29e67653fc1
font_02_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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