Malicious PDF — malware analysis report

Static analysis result for SHA-256 24203ab14bd37367…

MALICIOUS

PDF

94.8 KB Created: 2021-09-07 09:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 787986da24cff53feccd0426ca983c52 SHA-1: ef33400b661397b711a428aa9c70d385bed60f1b SHA-256: 24203ab14bd37367f044be397c5ac4cfc3f72d401407ecbb2a1bed71cb6b427b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://dnepropress.net/files/file/95771493766.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/953abc483f0b5f599f84bd399548a224/93720786167.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/7366487377.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/binuwu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/243420e96787c9fe60c1c9d1254a45d2/82342838297.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/marikakevu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/moekki64saoupajasc0bh4u9b0/82143073128.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f955c03987ee23cb8881c5d58d9060b3/mebisigoruxerupilax.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/8nvq1hst1gvqlsmt4b55u2bjra/20903427039.pdfIn PDF document text
    • http://teresachild.com/upload/files/59333811798.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/abd70bb15508411f466262b1b854410a/98918683291.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b3078c3e---nidizikoneputebasure.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab75871bc---gazonenufojoxosulazademef.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019e11f107---26559752603.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b4f950002cd816bfe35ec0f020692b6b/54602134707.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/23e7697e8d929fe3266d5ba112d815e8/zegenibukujarisuvutegozo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/tukezufebibuwasujeve.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4e4a4a41f59f3bf5079afca26c12a4cb/8528424583.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/71904056296.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/384380436.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/fabufupopa.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b337f127---zariku.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zajasufudos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=r+milewski+podstawy+ekonomii+pdfPDF 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_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 10896 bytes
SHA-256: 4a4935fa6e80fdc2b52701111739febaa2cf67ec27c24b640dc94728efb021f8
font_01_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 18676 bytes
SHA-256: 5cfb0e4d08f0000065ddb637bcebe810be167a78dd298579d54c96cabdef336e
font_02_sfnt_off00015564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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