Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b8313b0b4a7cf4…

MALICIOUS

PDF

77.0 KB Created: 2021-09-25 21:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5f11c1bcf300d0bc692d6a5061b859d SHA-1: 72c387ce433805b94352b119489bf2381ebed92a SHA-256: 72b8313b0b4a7cf4a0a11539cac4999cc3a877cce43c8f4dd82e2e9066acee9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://stelmart.ru/userfiles/file/rifakotesukufukalaxomige.pdf In PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/zojojobalagel.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/94577962201.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161426b6b63c7f---87664303444.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/49988552627.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/wopodogofudamogaxibowon.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zivavekusonopelurizuperis.pdfIn PDF document text
    • https://angkagenap.com/contents/files/35585096268.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/kizop.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/38922838282.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/siwonorim.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/2480716334.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/98870242661.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/99901042667.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/57711630442.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/49568032976.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/19748884847.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/72242631487.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/bufumebezuxojokenemonep.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a47d1ebc77---suzegaxamizifa.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/92078707396.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/matedovalubepupom.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4m3t7bir3rmlk2s27d8otpl566/35233424749.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a258c100b0eb9d1f3f5e0abacac6c953/tigawuxow.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/59321013355.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/6365315655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+heart+gold+gameshark+codesPDF 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_off0000c369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 10816 bytes
SHA-256: f2b4c3747ed01ceded32975d1614f7c7128fc341c5e87cb901a0c9815f18e71f
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 18740 bytes
SHA-256: 6c4b92a8c54a1fc5f85547ee17dcd990c498601237f98442e1c7d0f922b80577

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