Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f9a3c8c8646d9e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 05:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0baa532bbeee37d275fed38057627b2e SHA-1: 06975d0f53866da2247d618b0e487e78ed289cab SHA-256: 18f9a3c8c8646d9e683e91de5fd2b5a9f1c47bc6f744953dcf0373792e571a10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gphs84.com/clients/866382/File/jipoxiwinefijefanu.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/jijixeladanabiwidibezuxu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-17/20210517151517512231.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/manikemoga.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b0088769d32b8b36ae3ef4c8a6018280/25205564056.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/97390aec1dccca3f47d8494410d6fad2/kofupugarisor.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/49520672775.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c739beb50b1537d41ae819956cd14489/10641447203.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076509043bc4---fezalereduzavip.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608554186abea---kujogadazer.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/valelunezowetozafuzovexus.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/fcf91efd00ef01e3bad71b9737c9dc2f/87755221285.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c85abb4c2b98821f714f7d6c7e04492d/8462735467.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/54106764170.pdfIn PDF document text
    • https://diphong.com/uploads/badozegibuji.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/vejidix.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/bofevojudelewurexetev.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2gph15i55rmtrn1a0dasaq65d5/wugejadoxeluzoseredimuz.pdfIn PDF document text
    • https://olterus.info/contents//files/nuvuzubikedikakezapok.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/gujekokiwum.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b993f96a0cb---mozibexixetitelu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/689a5b723ece3e4bf60136e62e566277/73907383496.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071654e3e49f---49454239457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=simple+irregular+verbs+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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 10900 bytes
SHA-256: 0874780bc1951efd245d1316a260986134f77654e0eed6870e4701fc3900a9b0
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 17544 bytes
SHA-256: 47d9fbe98452b00a4e73fbd592ebd38db446357a9b870e0a907dc1e5f0e44955

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