Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e04a26341559d5e…

MALICIOUS

PDF

83.7 KB Created: 2021-08-17 16:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d09286e5c6f3e79382ba6651f01a3e3a SHA-1: 3b3fa4864715e84b5d739bdaf4060bee893f182c SHA-256: 2e04a26341559d5eceb606bf5abbdaf5c57456989a74756c403acd5a3bb2b6fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to execute malicious actions or redirect the user. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=arris+nvg443b+manual+pdf PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/edeffdb7030a836cd130ab5fbd766aa9/joxumu.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/tibidapojunenotopevi.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/84368699802.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/pirerukisowopupiludesuti.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/31b8e7eb3e971313e0510df5535ea22c/gogonukilifefizekagepuw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919b54310ec---88585905738.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/92918485639.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zalovanoferuxa.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4c854b15---pufotase.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ae3c0608a9597f05290986d177654c83/72005153347.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/vilitusubofolutumepameso.pdfIn PDF document text
    • http://123dvere.sk/files/file/76268084465.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607129ef69a11---66217611500.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74620276788.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074602d7e6ca---vadofavubevonukote.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094669b3f4fd---bediken.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/64199903315.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/872e7a145360f59e32ad2425c7c30398/widivesanusebira.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/94428331347.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/25548747045.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609029a8b56c5---43935462304.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbca7a7e7f---45329516649.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/diluv.pdfIn PDF document text
    • https://kamedia.vn/data/file/36294827748.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/fsg9fbsjhu1qc2t7bkun7ophpe/15362435571.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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 11028 bytes
SHA-256: 4f309719bad0af3ab5dacf283797028ec02df62e450f09b65c3f14a354d66e58
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 16876 bytes
SHA-256: 0989a5570f3d71205a4ea2d48f0709cc448d64349c4da5794352f3ecfeabd003
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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