Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0e937a52a59fa6…

MALICIOUS

PDF

87.3 KB Created: 2021-08-26 07:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89c1abc29a0ad9bb258ee91cde8b69eb SHA-1: 5fbb97cb9c9b8cba2fba773a434ba2f71803bcbe SHA-256: fd0e937a52a59fa6d955c21370ac239854ec9d829ff6f261196c13b8fe2446d9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070067873a01---37165191423.pdf In PDF document text
    • http://x-site.by/upload/editor/files/tuvokaworox.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bulotapojuzinedemewuxo.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dinomibojuvexajajapu.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/mupege.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/1343592219.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/jukopu.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/33632424654.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071578deae63---gaxapanonajagaxu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/nudolitupafovutamiruxozo.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/94896583928.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f8dd6f02bbc46e73f648f84a78a45621/10674357164.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/26597354685.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/302353548591.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096051dc42a4---48266056880.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/pasogazenajizulumuboxabi.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/46203614956.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j0l4gvfsh6gnvbunuo84gtc7ts/91032638445.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff7c184f4f---73252484497.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g17u9ic4bvieoaqdnhp9abd1n6/6354554447.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a030aefb36---wijamejelijigosemasavemo.pdfIn PDF document text
    • http://linza-market.ru/upload/files/76019892363.pdfIn PDF document text
    • http://accronline.com/userfiles/file/pilixajemimudezedamamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=in+what+language+is+the+new+testament+writtenPDF 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_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 10572 bytes
SHA-256: aefff618fe876e50bf458b0cc8bea80339d5304740f4fcf4d853b96c6473bd97
font_01_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 23692 bytes
SHA-256: 847e2424c2002dd5ed37714c43e93ed8a23e2d018d347d980e0bc061914150a2

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