Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb45761e4fe3d74e…

MALICIOUS

PDF

84.9 KB Created: 2021-08-16 13:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b14060fe20a816330e90d7d16016025a SHA-1: f9d82e62b4e6beb27e726e27372a1ee5558a5b14 SHA-256: fb45761e4fe3d74e2f2b044f6fe4422e4f5ef0f73fcd915514f585a5b9d94c5b
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a 'mafia city guide reddit' UTM parameter in one URL suggests a lure to attract users interested in specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=mafia+city+guide+reddit PDF link annotation
    • http://atut-biuro.com/uploaded/file/kabuzaniromunexuximas.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/kutalenimiwusazunib.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f82398be---97910305781.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dawimeg.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/84907bf0319cd1afb51153607103bd61/rulerixuzok.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/64002am8alrd43k48ns6369od7/pazoxenis.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beed4bc451f---suduf.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/wuwidonakuxufuna.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/5357298911.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/18761771622.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/jalepiwajatobedosuziwa.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5344649234ad1ee75e1077edd04c4f53/zowarumopu.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/vofipawudanigupidusebabur.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ecfada86e---37802864179.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/95689379840.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/4gjcp894hgqv71d0ei41upjte7/bavejodefeveteromisap.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/kakeminibibulisusaker.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/17102224967.pdfIn PDF document text
    • http://elitvorota.ru/f/file/tavefosawibavudi.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/sawufesurefab.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/fegisulerologibip.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 17492 bytes
SHA-256: 4d47b3114554a0cc36962f83bf1da36fef837a7c372ec991a43308154ce516b4
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_02_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 10420 bytes
SHA-256: dbaaee891c60e840d0c41669bb603e373c40868e544dbb2fefd4a3f0ed3cb363

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