Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6045d5b25bc31d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 16:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 813edbc56b32957ade91fd124713e9bb SHA-1: 8b435e30e16b6e2159b5e5832508d2ede6505063 SHA-256: 4f6045d5b25bc31d9aff6f95c2fae9f074609f0e9d643891c37942e9a884f000
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of these links suggests the document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381c087a6e7---nifetawuguwab.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52ebb7f9f---88786034195.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/netotuvepinumetowupe.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614045001f1f0---tazusasigigamonabexujawa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136815febd59---batekepumelanevan.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/13042564242.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/48678632438.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/tixavidotuko.pdfIn PDF document text
    • https://casaalu.com/luutru/files/nesupirotijetit.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/lanimupevidowujipenides.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145dae89089a---80457190208.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/34656665882.pdfIn PDF document text
    • http://etkenkalip.com/files/libelopixizenawobitu.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/47455739023.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210913_49B802D457061C36.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/13795165458.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/renuwubo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/61fe69a53b6df250da68f5e1826ba017/79607615881.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613befd25a13b---52879681669.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/vogajixufobepibofozozepib.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/najikekabajiraj.pdfIn PDF document text
    • http://ailizia.com/userfiles/judivajilelog.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/tuxixavelorazofujibukot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=apk99+gta+4PDF 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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 16500 bytes
SHA-256: 6c7f69a91bcd1cf1de9f423907343b62466aaa451f69bb77ae14b3b31610a2ae
font_01_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 9984 bytes
SHA-256: 3c320c5e83a8f0e4c4f5dad2b3156caea048d8d2a6bd8a3b8d9513598a6a7b86
font_02_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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