Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da39e82e6fdcb36…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 17:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d71c8877194637fc37f6863e5b8d2ff0 SHA-1: 6066560433e7e39e46e347bcd551b0824cf0e931 SHA-256: 5da39e82e6fdcb36af531bde29d33105ed20c2c83e376011a10754c53d2fae15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, redirecting users to various external URLs, many of which are hosted on potentially compromised or disposable domains. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests a phishing or scam campaign aimed at luring victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=the+french+revolution+from+enlightenment+to+tyranny+pdf PDF link annotation
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/32917434522.pdfIn PDF document text
    • http://consade.com/userfiles/file/99512155401.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/xadipoter.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075cde60d2b0---3598025305.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8q8tgm2grca6vf96pjt6e0kon5/sigakugewiponitukekekija.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/27348768008.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/jofopogekirajagataxor.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8vndckldfbppgbvljth9cgdfi6/45024586522.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/43e502d2526db88898404cc74e06acc0/63425471550.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5c4326cfa---tasenudolinuvawi.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/jugunipudaxivafiwibasanin.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/fabaja.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/56476837625.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/57586403821.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b1ce069358a02f27479fcf1207f5b8cf/49967998585.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/jugakoneve.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/bosogofubepijuzupewitaxuz.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/39472799911.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c7cef60d2a3dad342258b74564958b93/50875348540.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/87257307201.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cc1f231ba637b667ed670859d054c5c5/7445952769.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f7e50bde---90412944656.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/57571006621.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/purubedag.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/jixonigularulitakidotes.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/xosamanotawugonesekudus.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_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16684 bytes
SHA-256: 12494a26eaafcff09f6bfc0e331b7cf44fb67009fbf63acc10b53ebcb25039c7
font_02_sfnt_off00012914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 11140 bytes
SHA-256: bd73941eacf88cd930660859c93cac6e925f7438174bcd171c2fd8077ec85a65

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