Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e0f34cd891f406…

MALICIOUS

PDF

138.0 KB Created: 2021-07-02 07:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bf47f5008561a13e9c43d66b71740da3 SHA-1: 95e2b90aa6205148edb47e94ef830ba416fa500a SHA-256: 16e0f34cd891f4069ebe706bad8cbf2b6b708ca0f36397a2f01a464c134f7dff
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the execution of further payloads via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://garglob.ru/uplcv?utm_term=explosives+safety+manual PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d42c09b325---vunam.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210507092021.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de864a8c297---faxidefokipekazivigo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e6b1fbcf004d782d17285dc97908a959/davidubekosazimaruz.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/jixafifiwudizudapij.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zapijumipuzabopeko.pdfIn PDF document text
    • https://2acontractor.it/images/file/25902147205.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf123a116---53933567939.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16084f640ea272---17863280215.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4ddc2de6570a89abe811df209da504da/22840188323.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0336472ae---supovebav.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3444ec3618---96788783462.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/63213242270.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/9222099124.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/g2qh7i05vrumh1clvd8j74dot4/xukogidezomelepetejupon.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/18757695307.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/gusubepuwixebero.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be496894cc---sinilukavaf.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc87abba3---zasolosiko.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5qmplp35c0ooc418gb2r52stda/59275545188.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5acc6aa---sunopinenidememekujivu.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2ebc41ea994c8c48af7ec1d2968df51d/73831953081.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A43E 17544 bytes
SHA-256: 124697aea1477c1393ead24e631319024a49727f6e622a0a3e57dc76a3972ac0
font_01_sfnt_off0001d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA06 10784 bytes
SHA-256: 8c4d256dc238b2520866a395731e55d0b5e053da6d022d8f5c6ac100f8700557
font_03_sfnt_off000202ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202EE 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d

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