Malicious PDF — malware analysis report

Static analysis result for SHA-256 21afef4f241367e1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 00:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ada3eac7a8c80e780ded6a27257c15b7 SHA-1: 820ca4d79797f2e2ce7d921f97d283f7ed7e2d4d SHA-256: 21afef4f241367e185f8b834d4776883ea3328944e6538477e15cbc9fe902755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=prefix+worksheets+year+5 PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609298bf33ec6.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210720_215157.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/595d54998869dfea2981923d5e62d3fa/tetewewogekedi.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/juxikiwumefakuxox.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/62644982803.pdfIn PDF document text
    • http://holzweiss.at/luwedosa.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/fcb7412cd9d67fae8a09fdd2b1ef9388/98990699713.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fbca2deae6---13386503343.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/72771460796.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/8287781127.pdfIn PDF document text
    • http://briztravel.com/upload/files/demikoruletede.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/53761217687.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b361673f3---tudupigobirom.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58b5969eb---pezavemizaz.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/zevurot.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///doluga.pdfIn PDF document text
    • http://www.bandungmesin.com/file/70324707589.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161034d6eaad36---29388422962.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/22158934626.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c0fee9a3e7c4104ea8850f5c3abc0179/peposananeziposagavujuve.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/xusotezabalaliruz.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/jifufatewolapejitil.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c419b4b8924---44376088633.pdfIn PDF document text
    • http://caramelitos.sk/files/70783178829.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ua3psd9p6mvjaet00stj0u35h1/bajoluzoxuwazoturel.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/bb51a1fc5bfa2fe5f525130b28d6b663/33732098046.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_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 10688 bytes
SHA-256: 1f90db6b2ba0b04e15dc5cc29de0944a7a55c7f34b102ac95f4b45c344fc9d30
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 18096 bytes
SHA-256: 00b76b6e1324a966a91832fa1df702b873e79e5e80e37754aea156409383bb90

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