Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d896557875f4cc…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 04:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5321339c40881c3febd3c03251f5745 SHA-1: e6ff13224d70a2d6809926529ffd9efa4fb5de4d SHA-256: b3d896557875f4cc232314359ef01f97de416226bc82ce0c1efc697ad213ad9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=modal+auxiliary+showing+obligation PDF link annotation
    • http://deltools.com/userfiles/file/dudifopom.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe9432f2c---dufagedu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b62a1aff3---xilazupa.pdfIn PDF document text
    • http://indemo.pl/Image/files/79107546623.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/i6tcv1287ndi5nqai8oj80vt20/796783163.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/72490138685.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3b14a30c9ea8a072c6581a94c9a079dd/fitaxuvajixogeve.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/dujekakulilolurasokid.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nugowirazaduk.pdfIn PDF document text
    • https://shidoremicrosys.com/media/senurifatuw.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/30685379666.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3aeb42fd9---97201508906.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/965d84d5f0533b97b6148e8b39a30802/tobumubasa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f36456afe---7843570582.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/36310959610.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/6457780304.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/pusibubedamuwepe.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/22698230123.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c16768fd6---sozurukulizoxo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/djevj0e03fd9jf9dlajuqub1h3/walovuvin.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ucu065g81nnb5k1k75rk3kjvev/70679403844.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zetokidodelimalozek.pdfIn PDF document text
    • https://castel.ro/userfiles/file/92800951197.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_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 17120 bytes
SHA-256: 3dbcb608b87d3765fd9b717fe46f2217776dbdf021df593de36067eb054cd8bb
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 10928 bytes
SHA-256: 8393565239d8a49b74c1ae359bace2723a50a5eed664e00454a926898387f36f

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