Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa0f5f2f9fcfa24…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 21:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a2a580f44adddf0156463090a32379a SHA-1: 1c9c3a3f80d2e3ce50201440a06e93c391658a22 SHA-256: 9aa0f5f2f9fcfa2488557edacc17869a403db98d7f08dc33c4fd697687379fdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, suggesting it's designed to redirect users to potentially malicious sites. The embedded JavaScript stream and ClamAV detection indicate malicious intent, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=to+have+something+done+exercises+pdf PDF link annotation
    • http://proxima-design.cz/files/file/57760135412.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/kaxikimowefijuwedinadijev.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/80534586283.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/3784084392.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/jisakagov.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/54991321015.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7ac22b22---54061632820.pdfIn PDF document text
    • https://penzion-palice.cz/content/bemavulevisexegop.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jenojusok.pdfIn PDF document text
    • http://badgerhillfarm.uk/93571294513.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1b558550888df788e731d4965ea87445/tifiregunusewigudifapoz.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/pumupileve.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/15482458387.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/ruketapewegezomasufew.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/likunirigomoweti.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/texikasuwufepeze.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/65577336429.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/demelajogozodewominufu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/60946007446.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/54643192093.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/34869964251.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/kemuma.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/61701416127.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c270fbe6---kijudik.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/linaleru.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/29422698122.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_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 11152 bytes
SHA-256: 8404ae958e57358b7b895ad734c31e3eaf6271a00ac9f60eadf8451107bf2c22
font_01_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 18160 bytes
SHA-256: eea391c959742cf4c2567a019a395a847702c5270f9a339cb6d1454ef4cf7a68
font_02_sfnt_off00012d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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