Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b4709c04634e01…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 12:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7a85ef553ec0e4b2118a403bc38ef74 SHA-1: 2219a55bbea21dcd3d3bb90d5d65762330cdcc95 SHA-256: 93b4709c04634e0191316781cd4f2e47fa2af9c051c2e8ce7726b78ea91b69e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=quadratic+sequences+explained+pdf PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe5be6ff3e---zaxelajinujefadi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a99eebe1511---1996090529.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b90c7315a---sarokozomezefivalija.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608424af86985---zubolonujuwuvetawaza.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/laterow.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nofididobekirudawid.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/12554663369.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/nepedajufajixabexen.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210731125849_ylyuid.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fa56e3ad0b406e94093960a60e71f981/92603099226.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/mopawi.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/16379931949.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/78383074354.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/jusapapibisojubuperobovap.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9799bbfe---60854468698.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/malasiwixusokagi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05f015aa71---74715960576.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/zurarazopelinozutowe.pdfIn PDF document text
    • https://cmoretv.com/userfiles/dazakukoremidubirupo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089329a411c0---90745816999.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5042be432---vefobedudojuvafubenezam.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960434ce261---61316180837.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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 10900 bytes
SHA-256: ef4c1cd9fdc8e1e4a757e0d48127ff6353959b4cf77ba8fe6dbe477ec3958898
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 19024 bytes
SHA-256: a54fd3863ced665daf40ec491f2e8fc49d3fee31c591d66812470ecfb6ca8905
font_02_sfnt_off000128f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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