Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb6ac48bef20b10…

MALICIOUS

PDF

85.5 KB Created: 2021-08-18 00:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89d8f982ae3b22adafa862bcd744e22c SHA-1: 4aadf79f032ab53370b628fd269bb6b635e1be1d SHA-256: bcb6ac48bef20b107ad20f85a1a6fd9449fbd033ea4ce7c9255ffa7592d182d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://allytemp.ru/uplcv?utm_term=illustrator+logo+design+templates+free+download
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/5asaajpalghe1cj0cl744lcr4b/kamoreko.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cfb506c4---mugimozosunumogowudux.pdf
    • http://fine-trading-knotwork.com/uploads/media/lutikize.pdf
    • http://fruhmann-elektrotechnik.at/40542893947.pdf
    • http://werkkledingverkoop.nl/images/docman/files/35989798608.pdf
    • http://thermogroup.ru/uploads/files/worojawajokedagogob.pdf
    • http://seabeachthailand.com/UserFiles/file/62477284624.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbe466f7ff---64883754059.pdf
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/49449707519.pdf
    • http://mim2010.ru/userfiles/file/fazubajekizu.pdf
    • http://straps.by/ckfinder/userfiles/files/18949578533.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d699663a16a---33369852422.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6af61f4e---42385705364.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5aaf5bf62---daponap.pdf
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/49072695102.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/24eed55e4a0fa9d824e6f63d24c56253/99648986411.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3d90bf188---78314252424.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2824e50672---97003106718.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b09c0dbb622---89478324183.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b0a5f34dc22447d659f06f0b1873060b/xomeladozozejewe.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4687d918a8---buxaremusapamebu.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5835f1350---bururakilovi.pdf
    • http://np-laser.com/upload_fck/file/2021-7-20/20210720142301539641.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec98.bin
ee7ac89b50ab679cd77f2927f30a167de758fa4da2a4d53d3fa1c59de6eac94a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 10976 bytes
font_01_sfnt_off000105df.bin
8e24b928eef35b4d6d4615ee43fc1853a7c7c9f17a020c9c5c061feea6cf813f
pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 16112 bytes
font_02_sfnt_off00012f57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes