Malicious PDF — malware analysis report

Static analysis result for SHA-256 1501976844ab0f0a…

MALICIOUS

PDF

100.9 KB Created: 2021-06-27 11:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c935d124d25a0301779bb7c9867d7e18 SHA-1: ee61d00febe08d20624ae09b355435cf835146b2 SHA-256: 1501976844ab0f0ae20c5bddaa48ec8d04af1b81e6355089231c3789c0beabbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external URIs, many pointing to compromised websites or disposable domains, suggesting an intent to redirect users to malicious content. The ClamAV detection further supports its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9253

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=tuesdays+with+morrie+important+quotes
    • http://cnc-soustruzeni.cz/files/file/82642061869.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f491e9ca96---kamaxokepepoti.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/12025711080.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf40348db8d---tojupug.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0441faa399---1924226983.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rsrl3kgq2o87nd433dsj2h6up6/46533869410.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ec8027b7fba7c502b72b36cfa0fc806d/21608638103.pdf
    • https://gazelletr.com/userfiles/files/mitategivibimukinuveniwe.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bf9244d3---26352671909.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/43baed20cb9e86fb6f64fbb87643849b/93187462116.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc0f5e54e---favadomotevilugajepa.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4361d4a3---susaxilenitoma.pdf
    • http://guides2alpes.fr/uploads/file/7703589382.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hevdtt3s7rfe03lt2pcqlhosi1/lotovarifexowudozojo.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a188c3aa742---kabanuzi.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ff0053de---viduf.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2cd59497a99bb4b1ca19827faf31f6c7/lovuzigeji.pdf
    • http://loadcell.vn/Images_upload/files/nazivutawaxuwezugasu.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddfe1402a8---93167135906.pdf
    • http://comp-art.ru/userfiles/file/21273335451.pdf
    • http://tfforming.ru/d/files/76277978801.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fb73d8852b04bf34ae1f5b04c1f18a71/73668824973.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a21a8cb2d3527dbe86fbb3c6a8496e53/42263183348.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160851841535f3---karuvam.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b761c51ee42---vetazerujenitup.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c517fc80d7---41278904823.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779450dddf3---21810816969.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/6kkaelrakgq628j7qd6v982qr2/6983697094.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010469.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 16792 bytes
font_01_sfnt_off00011c7b.bin
190cd51e17c8c3d47afff5b1481cb012b3d6fd02fb503d95450b98fbf65129b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 17984 bytes
font_02_sfnt_off00014b58.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B58 1636 bytes
font_03_sfnt_off0001532a.bin
f7a2675593e3cbbb40bc55991a8a74f25eb438f6072060cf0510e83ca1f44c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1532A 11020 bytes
font_04_sfnt_off00016c76.bin
01a462048486e53b7ab35a32575cd48a76cbcee04af3b4df772b7386f802eb7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C76 16456 bytes

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