Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b3fa2d07700b53…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 02:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54cdc9ecdad00388887fd71a55f38886 SHA-1: 078300d2e8252a070154ed3d80051f70ae59da3d SHA-256: 83b3fa2d07700b5350352c8547dae1aed6da54c3703d84b5bb260950e9dffca4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The primary function appears to be acting as a link farm to distribute traffic to various compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f500276e2d---32930782708.pdf In PDF document text
    • http://jn-zhsc.com/upload/malimunirepiliz.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/82e9df5a0ff68f55940dec0e1b21149c/87405112942.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f435ae90b6c---71353908654.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/5242720132.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ab5914b18adade70f17b2fda36f37d34/tufiviz.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/sekotabojusewojotuvode.pdfIn PDF document text
    • http://momsystem.ru/public/file/nixurokadukarotutamig.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/32451daee0d7582294f525bc904a7696/73910230680.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072919dae241---82692429854.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b3f6dbc3---musukonofevifukikije.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/48279564388.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/34968681619.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/js98cttb8oudv65ec4fmfanuc2/sugaroremula.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/mugop.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lipabuzuzelupilifaxij.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b555f31240c6a04a7b35ce960de742ad/dilovexolidiruta.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/taresozabodufidazaku.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/pulelisewozelor.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wasigukomozo.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210530_A8CABA6374E60751.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0344091b---nexomigomo.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8b53f9b33d1a68e1d7d3580e5751a428/suxoxusanobativuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=convert+measurement+units+worksheet+answersPDF 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_off0000cad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 10700 bytes
SHA-256: 840e8539b76a059e13048398e2e45e8135f7452002c985d06af1140c2f007beb
font_02_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16896 bytes
SHA-256: 414e76dcd0d5ede901b8d40491d989f209be593a984efa6f5c7fdb78e648df38

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