Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bce1e51d6da2f1f…

MALICIOUS

PDF

92.7 KB Created: 2021-07-18 07:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65ed1fab838adb3a2fed796df7edd9e9 SHA-1: 4e08da908959e698bad4d35e620b15f9c5d92330 SHA-256: 6bce1e51d6da2f1f20cad125c19006331609c767677854ac1db619a03b1ba246
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs hosted on compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6e155374---gadiliguremexuz.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c43cd73e410---13646138771.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5296f8613a413e5c58b91dbfd1617d63/87103506135.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3357e04cfecda5650a3f1e94a3231fd2/83587374577.pdf
    • https://washlounge.in/ckfinder/userfiles/files/tekawexeriwifuduf.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a9b0a55a4---31874330737.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944a8c6fc20---99955197760.pdf
    • https://loctra.net/userfiles/file/88353855487.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/56b898af16af5f6ffbfd8880f1458238/24595713432.pdf
    • http://mateuszkucharski.pl/admin/file/musaxitilano.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/73d7fd2366698f7988beb0807ce74783/50272939267.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4440e13d4c90fe598d1286b494bd5772/nejeva.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c7d3938fb---refomogizak.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ae8829e5bd2c0a3cc20f0b65c2a69c63/40258130650.pdf
    • https://leosservices.com/userfiles/file/3431490674.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/kutogiviwoxuzedowizibiwu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c62fe9c24a0---12183417556.pdf
    • http://border-inn.com/CKEdit/upload/files/venazafamop.pdf
    • http://ray-king67reunion.com/clients/41562/File/nerilu.pdf
    • https://cafemocion.com/userfiles/file/nexidilogokurasapog.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/jomis.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8h0p4hjdhhaogd3shulujbs8o9/virafugozefuraganizikani.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5ddd546a125dfee39da408747340b209/rejejikenopi.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3000e9312f87b36a424b65dd52eb47a1/rimaxaximipolifiloz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=protocol+meaning+in+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010176.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 16792 bytes
font_01_sfnt_off0001198d.bin
0d2c07baeac8b0f956f99ac37f2a7affab8955df840b89de5413e2a6fbfc7cbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 10680 bytes
font_02_sfnt_off000131d3.bin
16912ced3391397868d02fc766e256d5b9a89e8b12e9f72a0864a1a08c941b5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 19508 bytes