Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82fdee2fae8693f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 19:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51a15d2dfdae21a00c6704bd65b4d9b1 SHA-1: 2941351de0530dd3cba033bb5b96fe90f29083ce SHA-256: f82fdee2fae8693f984e0f89dc6937bbfb6d5d5aa1d4e730759ed0aeb677bc71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=class+e+adventurer+android+18 PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161443f98f0c6f---sesarebo.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/88971486689.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/75308086361.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146aee0962---guzuwojudog.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/luzemukomobijopef.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bujikobamaforiwibabino.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/mamonabiguzazurebiwixam.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/topev.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/feebbbd5cfa2971dbe7ba523bbd13cfa/javutomiporigoperoted.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mononenugakijuxuzogipa.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/70907401856.pdfIn PDF document text
    • http://midel.me/userfiles/file/7183602196.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/65424131329.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/42211700085.pdfIn PDF document text
    • http://telektrans.hu/editor_up/jefixime.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219161322466860.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/93189075373.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/33294093889.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8af9f884571e118a9c264822b5f2e93e/birugetaduta.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1fa13106ff9488eb1b0f5c31ae789219/93854495046.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nudapobelikiwun.pdfIn PDF document text
    • https://hobbypet.cz/files/file/50143678765.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wifotobomivusaxixesiwi.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/gakokomakubo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/biwudar.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_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 19676 bytes
SHA-256: 6f9db4e17216ee8a72a73c714cc3c8c69ea06697e35496e4a96970ce77c85dc6
font_02_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 10696 bytes
SHA-256: 6d47923ba3a51d8ade7fd07de92067dc91cbd6e44c00feb7ac121ea65986b4be

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