Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efcf20ba3ae9832…

MALICIOUS

PDF

84.1 KB Created: 2021-08-18 12:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0600c97e6caf762857fa7f7e585f0d2d SHA-1: 7cc0dd80aff6d620eb76f2b28fb9fd2556aa0f84 SHA-256: 4efcf20ba3ae9832a4804b03fe791f27acb1e7089725cab300973502a8731767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://crewmak.ru/uplcv?utm_term=how+long+do+burgers+take+on+george+foreman+grill PDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8789b1f0f---25679994073.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/50309950144.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4a5294f9---fenudibokubujebix.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/50790166904.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eec488ea4---31012796238.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/25867947004.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/33852502268.pdfIn PDF document text
    • http://cpils.com/userfiles/file/25118323793.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/61154353643.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j0q9j912nu1ogbmirssqkj4iua/rixexirobipatud.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/jexoxatodulinesazus.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608564189c439---16557780680.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/rudepovesuwaluxubonog.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e409eff1e898b4e69208ae57ddb47c7b/99569607451.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/89675217099.pdfIn PDF document text
    • http://medica-brno.com/files/77024149636.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bitesafoguxemepobolixiz.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/np7agbv0p50trffjln4m71if2l/81865662852.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/99881685896.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/getebemu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8a5eed23---sojatafelugoxuzumesi.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/xumex.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf6c16e8f---noliw.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/527263e65969bee946a40d7fa59f63a2/tamenofodawo.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/2oc709ha5ekb3u76rjhm11371k/48063715090.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a5785522603c319cdfcf5d194f314282/70238428902.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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 11108 bytes
SHA-256: aa7f0c442a5c42bd924b9d5cc6f0d100d92632e1c2476165fddfa5d95e1913b5
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 17108 bytes
SHA-256: 21ade624b02e375c98657bec71b986c07edab2eeb39c49f052f0435ea98b0772
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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