Malicious PDF — malware analysis report

Static analysis result for SHA-256 729a62c30566ee49…

MALICIOUS

PDF

90.9 KB Created: 2021-09-02 09:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24cb0ef4e964371764a832ecd46a8b7b SHA-1: 259fc72b07f6a1c2ba6333862fc4a17017bf20c2 SHA-256: 729a62c30566ee49bdda28d5ce0924206dca540a5bf1c1732f12bcd72fb8748b
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. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised WordPress sites. These links likely serve as a lure or a distribution point for a second-stage payload, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ab3014405---23597560101.pdf In PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/6c574b1db975dcdf958b3bfbde713052/46000152193.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/tuvesogimiwobofutot.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/zatasexuboneme.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f726a3dd69---66588772690.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/34091842650.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac282a738e8---75843316585.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/rubonesiwolaga.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/345a3246ace30742e8d05e5deed8181b/bolikunazodakufubi.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/64014678317.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ffea7907e713352fbc0026e77fb1c69d/96931278506.pdfIn PDF document text
    • http://svx.su/ffile/file/pigonudefeguvuwedewo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ebb2d1a32d530a607c494c69c6534d38/medegudegigevik.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ishkbnc3qfoi0anomsutdu7lj0/88826842913.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/jodebarutozomigidazo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e02c9843f---tugabanujubatez.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/45779297247.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6766d9ea823a8aa9a2ffebce1ecdd68d/42878760794.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/36048378360.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/92227064352.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/xikipadonigedinalodid.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70793237fb---xiletubeze.pdfIn PDF document text
    • https://silga.ca/userfiles/file/zugamokekupefezarowog.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/99990087469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fire+your+doctor+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_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 18100 bytes
SHA-256: ec0c349dfe3a8dbc207e8685744c1934c19c47dc3ad44ee321fa53c514844931
font_01_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AA 10324 bytes
SHA-256: 0a02434f00c528d8b3b1933efb1d579b889791d989d2d0f8359ea07c82eaf8b7

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