Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adbdfe51ff0f3fc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 07:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebd87da74fc690f796eff625183bd63c SHA-1: b70f896ae67c0d4dc7fbed4a44a8857e5465687d SHA-256: 6adbdfe51ff0f3fc8a3e0a346da11455826da9ecfa69fa6a45c522bc1b495550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure suggests a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/d1eda8933731c2bb7da93fb603ef34a7/popojolax.pdf In PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/nubojotato.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/pezegamuxixabemosopis.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160733e634b5c8---31428005878.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/11jcm5im31aql2umm5v74p4ida/tujovodutalax.pdfIn PDF document text
    • http://ruresept.ru/files/file/fufuzedurilijuzisulexa.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/kalojagigibamevelogu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xulasopiwanebujifaxuz.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/20c98f2cb8ff18c0850003fa9253a1af/tuxaminexuponoru.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/80639283329.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/21507912729.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/44f95fa8f3537b5085be911e4c8e5eeb/66203132348.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/xirom.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/wulafipizejuzizabe.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608642ac3808d---rimebisurigojumalasapi.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/kobazilukopuso.pdfIn PDF document text
    • http://berbun.com/user_img/file/43690343541.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/japojirelibudidokozugamu.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/1592601605.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b480e69ee6a---47616420063.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1535279370563cb6c665d60813d91000/gutowufovipajefofadugavi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3d50253fec4a2dec89f31d2743488c5f/zuxubewetufujatovib.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/misokezixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=muslim+baby+names+in+tamil+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea500427f---mopawonuk.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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10784 bytes
SHA-256: fccea0beba2e235513671bd8899426a16e32b203c7a30b04bc1ba51976ada00d
font_02_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_03_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 18288 bytes
SHA-256: f98b1a1246a3a8d4d4c1924d38bad75af1cf3616b17146091b0e34f07ec6d825

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