Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b377450cb86150…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 07:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64db0bc9fd9c0e72accabf0e8ab2cd8f SHA-1: a1c4c67bc7ad4338e278402be4928ba61a804515 SHA-256: 38b377450cb86150ec0aa0a4269e30d290716048ced62aa1daca62fb3e273ed6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic firings indicate a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=etl+testing+concepts+pdf PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sdt3ac00plltuu9f13c8o8l9h5/liloluxariju.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b470fbdb3b---tuvifigaselonodixemi.pdfIn PDF document text
    • http://e-sportis.com/images/upload/68315993908.pdfIn PDF document text
    • https://duel.pl/userfiles/file/zotaw.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/2794899160.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/22301431037.pdfIn PDF document text
    • http://buyout8.com/asset/uploads/files/35561608904.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef2a598aa5---vumebuvewuxugenikewiros.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/viajrmlrvitmmr3rvlv2ika71d/41203701140.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/14049771546.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/8576363089.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/51905d6f16192b9c50c4cfe2424a5fb5/64265338721.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/jezenalokonumego.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/37937876804.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d573b28b02---93577317980.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/38fb9ad45163d1ad916599a37834637e/zaweraxunadomuxivuvike.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/85359753353.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4f4cd3102bb95803aeea31a66c918d4a/totib.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210630_D33D86A58143EE7E.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160881a1641423---68201924956.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/fixodisagagigogejiwamat.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089b49c7e0ee---39572707585.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/017b2850abce1d2578f37c1b8f2a1b4f/43505647991.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ae511a97241---zegorijidozam.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_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 17756 bytes
SHA-256: 30a40405b1152b2bd83c380ae1cae5cb0a19491c1561ce688d966bdde7f2dea0
font_01_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 10516 bytes
SHA-256: d6ade0bc24b231abbd394543c9dabdbfe10939c882e755a06dbb8f72a4111d09

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