Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dce5f0847ba5e4e…

MALICIOUS

PDF

86.9 KB Created: 2021-08-25 19:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6681da30fd7d115aa2af7c772085c1f3 SHA-1: a5e308ebf1324fa674b9bbaf6e398c748634b32d SHA-256: 3dce5f0847ba5e4eb5b1fd5fa8a7479f94dc6cf9c6baf777b43bb7a4ba9590c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. Heuristics suggest these links are used for SEO manipulation and potentially to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://oniceh.ru/uplcv?utm_term=plant+physiology+5th+edition+pdf+download PDF link annotation
    • http://tischlerei-schlusche.de/sites/default/files/file/xojefilisopex.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/070f0fd4c5c2a01a7209587be9bff3e1/8808442078.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af087566883---8126435219.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610eab346a341---15739585766.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/pimidezojukinevuguri.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/30295336880.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d33b71dc7---pojepurowo.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/mevoma.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/88836060881.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607386edcdfce---ragamexujegogug.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/gadobinubotimarizerobe.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799cf059ab8---11551153059.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/badugekenababotuvol.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/265c164b943eb3e2258a0de3290a0da4/wapenelamodav.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/221uo0mn506bhonn4lot8l2372/kabovujumumapisivemuge.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/91626050756.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608276c71149a---loraxaxuvulaxokudimos.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53e759bbd7e2b55454e9d8a2e9834cbc/rolijizuzafajegovakatigup.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c83b89d72---22890494441.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160800513b4e8a---26272687231.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/45695534224.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052405453769.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/jipomowakobod.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/sodadeliwapefujevij.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/vesifobezika.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
stream_004_off00011cb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11CB3 16644 bytes
SHA-256: ee0f7fbba1acc2885810cb6758e5c55a12fb98941ec2bd8d3553e447e6b354a7
font_00_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 16676 bytes
SHA-256: 803ae32f5923206c9da3ab7ce27c3a5e7321826008518d38fbfa4b234926cfc1
font_01_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 11012 bytes
SHA-256: 86c051c1365a25ad36340a0cd6f5d7d6823589ced6342e8ad2f8febea744f9b6

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