Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a4d671a3c34245…

MALICIOUS

PDF

90.5 KB Created: 2021-07-24 03:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8660fd0ddf15adf49323e419eec1864 SHA-1: e1c24f779d5f0c9198e2a261f602e74eea98cf01 SHA-256: b6a4d671a3c342454fddf990ecb49c2901b7837cbf3f31c3c04f4986051d03f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phishing pages. The document body was unreadable, but the presence of numerous URLs, many hosted on compromised sites, strongly indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070afc640b0b---rubakixoderavokuxika.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08147ca2e---22912110142.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/uorsprjf36610lu937nknngsc3/makalujowekuwelu.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/f8e4695d81e7ebd398ff10106a8d41ba/foxexipi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e54a614cef5---vujuvisibuzakavuxozewuw.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/uq339igsea615jubqmhthg9o7d/fanumifolowov.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/dce3f59587698e696397541efcb76adf/31997303833.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/rebakudubap.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/68799745213.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0224e62f4d---xalipuxi.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/73659623433.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jesanisugigujemokimo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed3e5b854---95441950991.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6fac2aec5---fumiju.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g8v3t0t99n5qv4gnvqqeoi7l2t/10002623847.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fd4ce68e42de3226fd1e4d8b8a40cb42/73751590134.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jebavoso.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/zidilumubikuvolidonoxo.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/nezegisopa.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/dr73kjohitcu5qrb4b0caf68n0/gosikadavogigasur.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/85046153017.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d205687597e6d0d2664d7cd88bbb3c2/dadalot.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/zikegukawazajer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+charcoal+filter+in+keurigPDF 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_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 17280 bytes
SHA-256: 57927817423463e6d053711734c28116070c0ad1db6bdd9e219bf76d966e1022
font_01_sfnt_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 10716 bytes
SHA-256: 6c62f9c27ee7c04edccea3bc61a7e032045332d2846d191ae78de55c773f3f3e
font_02_sfnt_off00014405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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