Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b9957b701e4ef2…

MALICIOUS

PDF

133.2 KB Created: 2021-08-09 18:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb7685eece547e58ab564008c1f514ca SHA-1: 6bd53ac645659fc8ce3b2465a9b10a974fa8f2c2 SHA-256: 50b9957b701e4ef28fda7f599908c9b370c97da7c9a4e3d8cbf913cbddd017b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9537

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 http://au-zlato.sk/upload/files/suwasakegagikadikat.pdf In PDF document text
    • https://iwnta.com/userfiles/file/vadigulodosaba.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/o94adshp24s93mfp7kkk67i19k/jekuka.pdfIn PDF document text
    • http://freewest.at/72885074963.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/pawupop.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8soqtqdo7d6dpfkoert20hkj06/kezib.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/pemuve.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/l79gnmtd77vrenungt2o5nl3n7/bomonigofozi.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/51119725954.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/sukaxog.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/21246995932.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/989425d5000609cc9d634b4d1954e093/vazabiw.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/89501596868.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/97396985004.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9lh5go0u01huurhs4n9fj9cj9v/26287864321.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/raxunalasasamenozam.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/57344562154.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090398e4278a---bevonefalek.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/78071441756.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/62762552732.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad39f37035---lalezetifapomegeguma.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b99a77c0---dimafupasuvaxasoginapad.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609039bcc1cad---9174060198.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/22b9e22254403853e6572929ef762890/32675189896.pdfIn PDF document text
    • http://envigest.cz/upload/file/toxowebivaviju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=yu+gi+oh+duel+generation+ios+hackPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001d034.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D034 29676 bytes
SHA-256: 6d0b2285fa353b39689428b37e7efcc309922c4353981e2f0d4e3d49f2bf6048
font_00_sfnt_off00014b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6A 20900 bytes
SHA-256: df2865f435e892a63a9da38874721f14a2dde86e856ce0f5960620af925e91bb
font_01_sfnt_off00017eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000196c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C8 10824 bytes
SHA-256: 2f8a495a66d8576f1c58a662af878d1b937cf3fed755b1062d44c42334109b1c
font_03_sfnt_off0001af75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF75 9852 bytes
SHA-256: caa08785ad75bcb1ff91739c6d408b7aef6b878f04af93f0b5b76f6877f37511

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