Malicious PDF — malware analysis report

Static analysis result for SHA-256 807511ba7741b31e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 17:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0682ecddd16ce96b0eeec7e5ccf97247 SHA-1: 56df0bcf641822016e638d65fb6810b6dcf00a6e SHA-256: 807511ba7741b31edc7bea66165c9f7e98955cf1b3d634be10700d024c619624
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised or disposable hosting sites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is designed to host malicious content or redirect users to phishing pages. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/81099598531.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021051105103896.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/360c8d61d431d89a73ee8ba0abb3bbf6/9738707469.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160830382779cb---pewoz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aca51c81739---88487167694.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/24912975212.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/20594554781.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/28937930728.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/gifegi.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/fugajenurojunelegalomagu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160742c9d1575b---xenivu.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/79892091424.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/2309d538f227b415aa8fc899c8e40957/joselajes.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8506c4b52f---loniselojadivogonavof.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e88889e2c51bff8e65a39e853f270f0e/dawarir.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161180f19c0f76---rowixuwarumokeku.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff1c8d2c24---35677290979.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f68f8dfb758672d0be5684383db47a07/nelisexor.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/xapikos.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/79540432836.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609277bcb8875---83189773233.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f25984df736---16642771989.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/24274353087.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/nujenusowofemedojod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=toad+for+mysql+tutorial+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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 10744 bytes
SHA-256: 551da865e4af712255511dc1343347a8615eccf73287eac8119dd5f66f589900
font_01_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 17808 bytes
SHA-256: 880546f269811c8e5ce6532211bfcabd9f5b3a71a45db71e385f54b957c1bbcc
font_02_sfnt_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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