Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd568f2a90724b5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 09:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bddbe36ef6b55b1ca9f66064270dd32 SHA-1: 9b4cf39bce47ef932aba2a6acdc58b6518e7153b SHA-256: afd568f2a90724b5b6b6215e652a185de674fc11886897de4f71de1dd24b2268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irlanc.ru/uplcv?utm_term=top+10+action+games+in+the+world PDF link annotation
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a003e1dfa---vovawijamibibirevovo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jekol.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/17870376196.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c9c17f2bacadfd547fa19b20388fd4d6/tuwafo.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/gideretokogejenej.pdfIn PDF document text
    • http://xprchemical.com/upload/files/32235817541.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/35775542867.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/femopuxelas.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8161a8af---bojifajofumazufesudumeved.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zezam.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/sigumuxut.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/50404371559.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kcb6768pf9sj8caro7soo08257/dexezopodadomoxapikako.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/67698057003.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/37528719375.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/solezidoruwusokuwu.pdfIn PDF document text
    • http://gapp.fr/medias/files/zosuvuwixakevatajun.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/65800509849.pdfIn PDF document text
    • http://msiutilities.biz/documents/45531811863.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/41057366782.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/delowanezubupeburipip.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/89587632939.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_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 11184 bytes
SHA-256: 615089df1e52202c0d3d5ed58cba0f85d0f57b053d1928e2dab5b5d95102d80b
font_02_sfnt_off00010e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E84 17800 bytes
SHA-256: 06e0210f1f6d374dc9682010cfca35453bac1c55c95a92cb4fb168fc7036ab3b