Malicious PDF — malware analysis report

Static analysis result for SHA-256 9651d69a4f2ac6ba…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 04:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b631c81511b127d06abb9c8acc49eecf SHA-1: 33bd5e42c609f794a142f5b7bd53d1d9587de179 SHA-256: 9651d69a4f2ac6baa0075d893cbe17be27eec2b78b6dda773d58f8d45ba4bdd1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://infrive.ru/uplcv?utm_term=rome+total+war+download+android PDF link annotation
    • http://harchovyk.com/userfiles/file/64272087804.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/57693566479.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/86516967970.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614684c4e7c39---78707174406.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/57582381259.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/57822054156.pdfIn PDF document text
    • http://besteva.com/upload/files/lerovuzejizufimununopev.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/97691080558.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/vemironenideguvuxes.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nelazoweze.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f74309d4b7---47639718956.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614655ab27c2f---87575581293.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/65914771135.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/kosibapov.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/xelemagekizixoxawi.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/97843430550.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f261c2204b---zekajedipo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359df01ae8d---dadibelazenefed.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/67939737431.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/38204674317.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/75867654499.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/putenelak.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/bifixawefezuwufusogo.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/tijajuzogugekaz.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/perevemegijaxojafesupu.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xefakegusogokejafogadu.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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 20012 bytes
SHA-256: c299271c15295f236cb590a9faed9562b06f6564d9c58b8fc645fbc8596d3a3a
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 10372 bytes
SHA-256: ce596df551f85917543f1f0648ed588a5d9f926b503331c161d182cd310c6e9d

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