Malicious PDF — malware analysis report

Static analysis result for SHA-256 379b7665bfba2741…

MALICIOUS

PDF

78.3 KB Created: 2021-10-09 23:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6e20a73dc79e35ff74b8c6e5b713998 SHA-1: a31bdd2821d9e962645e55b6a59517280fad6b95 SHA-256: 379b7665bfba27415536abe86dd9cce658983f0ba84e46e1dd81a188b363760e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and numerous suspicious URLs strongly indicates an attempt to deliver a malicious payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=how+to+draw+animals+for+beginners PDF link annotation
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/63331395322.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/wojapevil.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/zoxuz.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zerojogebuv.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j8nmkmiahbna61lb11lqmi0abt/26306492245.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/8296166571.pdfIn PDF document text
    • http://fnathservices.com/upload/file/55080590403.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kepapare.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/48577581168.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/78686804555.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/22637587495.pdfIn PDF document text
    • http://short-story.ru/upload/file/16083411940.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/55364429008.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/jojulaxuno.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615aac5ee1669---xugakekubudamiguwudemo.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/38894251561.pdfIn PDF document text
    • http://askort.pl/Upload/file/81081678030.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zaregukowopeg.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615f795d08759---sigadob.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/nevimedadeliz.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/gevuf.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/totabalaz.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/burililexesalof.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f2ef33b04f30c779c05db7c826d36a54/94271141686.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_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 10916 bytes
SHA-256: 0f9788362ca32cb73e295e2aa2b66acbaf31e9f22219bee8d95aff967f80767b
font_02_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 16344 bytes
SHA-256: 3a3669b89e021b4f1380fad2cf840a752d5b67ff41fec49bdaf65c15f0c263b9

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