Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33c66e4825531c0…

MALICIOUS

PDF

101.4 KB Created: 2021-07-13 19:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 218097bd7348a765d3d44722b0e141e9 SHA-1: 28bd994c5f993ecc6d9cb0827511bc5db4e41769 SHA-256: c33c66e4825531c078b9e1ae964cbb4f6db993b49a65de7723c6722d045c9e46
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://csc-0411.com/userfiles/file/20210630141445_9y7wvs.pdf In PDF document text
    • http://derma-dts.de/files/file/fovivaruxorebewaxum.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/sopuwunefifapirexox.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbd110bdf---77599887351.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b3402e7d7f0f4606e887ae1b9a78bca4/53405561808.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/vawifilob.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/14779665049.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160758e0b0ef16---wiralexotavanominuwe.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2665228196---17391187947.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5e6a33f210f0df7e1214f5489cb8399a/26835988854.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/torajexasozafasodarejiko.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/8044995706.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8325b1577---vipilubukalowo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d917a8aabf7---52218599215.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/82e8151ea3d92ac2ec0f50a9c90ae707/60314617721.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b2cv9r6tmi0ietc0k44m91ctn1/88267876865.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6b746116---lurikadufiranukozeretat.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/vedebikusubifonuzokodom.pdfIn PDF document text
    • http://deforma.it/userfiles/files/fibeneloxiwik.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/18fa22e4a9edc6ca0df98cb99d0de4c7/lusefativowebixegiwiwofig.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0kismt8tl9n2ad3ehs7vcr1ih0/21013169554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=types+of+consent+in+hospitalPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/594dd2f350d613df59537eef769c01a1/dawevow.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_off00012d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 16736 bytes
SHA-256: 0ebf66000c575d0d336d57f996d6dc32bfbd7c8d2348a459d5cf45bca97bd38a
font_01_sfnt_off000158a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170BE 10556 bytes
SHA-256: f4cf8a82b7d1a3b53af36a51f0363f3596b401ac0222864c5ad85d2c68976873

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