Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc25b6573e68bdf6…

MALICIOUS

PDF

98.1 KB Created: 2021-07-08 17:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2bc53b0a188e562c1e6d099324e06b22 SHA-1: 10e103f25f0c72343ea155308b13638a4cdb9e8b SHA-256: cc25b6573e68bdf6da6dcf2fc633d7c09acf2817c150275495e1e79a5f4d8af6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF itself. This suggests an attempt to distribute malicious content or phish users by redirecting them through a series of links, likely to a final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • 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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/5dc42f596ab42d0fa4b9fc15bb263d7c/69339836212.pdf In PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/21266471618.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/najiwoj.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/zukinuvejivusawug.pdfIn PDF document text
    • https://koratspring.com/upload/file/zuzafamijinor.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c519d16899b---97874189995.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805913a7954---81713110330.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0ok1fl43p2ng0s6mcb9su0n8tb/fadiw.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/83697591554.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5a5d82a9---61949968636.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubimogusomuxatuwiva.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9b4htd9otcmnp75nefu92r53f2/tidajaxebupovawo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e99ebd3f---vorajewodazarivupaka.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/22671056562.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mevkfbokmaa7geq9eg7p9prvte/52712760965.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/64063976090.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/laberofimuvamodogar.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40e723cb4---55816023589.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kasevazefugunuzifaf.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/92350895018.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/55613744606.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jekulirogapukimonikaxat.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24860590381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=non+disclosure+agreement+format+pdfPDF link annotation
    • 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_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13589 11040 bytes
SHA-256: e773efeb25d2fca0a2e4cd88955c6d00217d2654f31ab91d077c998d39b90332
font_02_sfnt_off00014f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F09 16980 bytes
SHA-256: fcbe4d7b9dc9873150965c2911f9499b49d16deda3bb8a5fe85407a6d0c29149

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