Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb618750775930f…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 19:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8cadb5bc370c15c24f027f0458090aca SHA-1: f047afa7b942f672cd37d3af4a193386e990baac SHA-256: 3cb618750775930fad1aba8d19c5b6757ce364204722fc794ef301938fc8dd03
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be malformed, likely an artifact of the generation process rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=how+many+questions+can+you+miss+on+the+dmv+written+test+california PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/seekiin8n60o5oek0653mltkko/xusisojama.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/51126972483.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf486c95db---zonig.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/5186537091.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d883efdb4ee---55746364021.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/6893142431.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d195fdc1---zovavemejaki.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/pikokuvowabifat.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/96459371486.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/piwijemunuxewegolojaz.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/510c2a9c0d20487e5e0ef74dd72d2db2/wevusik.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd61d9973f---50094343824.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/16429286821.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/32639299387.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/16143968343.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/574a2dc9ef34a13200ad6934c9593779/90951818599.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/419b0932a70afb47db0fdb7703c3a3f9/nefexobivixifoderon.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/xavuponakepetu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3a1465a4567fa152872fb3e813c8c7f1/balafezifovew.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/12691007608.pdfIn PDF document text
    • https://begili.com/uploads/image/files/derugobazikupilomifuw.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44bd270b36---gonijetopefezogekame.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/71420492545.pdfIn PDF document text
    • https://fallsplat.se/file/55647629667.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_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 11244 bytes
SHA-256: 731e1e5ad6b270ef40f2d7c6e027aff86d5ca9fa47f9d2b2753caf893e0509de
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 17232 bytes
SHA-256: 305b5af894cb9675957119d8910e6271cf86dbda467b1418b71be4c3b70529cb

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