Malicious PDF — malware analysis report

Static analysis result for SHA-256 517e55df4b52c0fa…

MALICIOUS

PDF

100.5 KB Created: 2021-09-04 23:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b66d4727c79e03999884d973869c2d42 SHA-1: 20a99500d1484c4e20117cb9a9df872eddcc63fd SHA-256: 517e55df4b52c0fa07a198c0124ac161b1e0392fc48911236e4230b456672b30
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting suggests an attempt to redirect users to malicious content or phishing pages, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • 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 http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a458b893575---sefixo.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsj34bb5sg4d7lobs3qpuekm91/95919164171.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/43093539021.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/fufobimexadenu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2aab6d577---xeduti.pdfIn PDF document text
    • http://ciskmv.com/css/file/nogifikogudewoziziwa.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/53632644452.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3781245bb2---kugofobedagigudej.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/bujejijinozenizanulesugo.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/87uur1qej1t8to8s56e9r8a8n0/68260317321.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ce7a06dd6---40098189230.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/ribajewuniragi.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/zutikix.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/kedipegasuna.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/gegojit.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed5c0b124---lawomuv.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/sagesoduposegetozetakofa.pdfIn PDF document text
    • http://bociany.sk/media/file/42412793642.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/91769494689.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/66686405917.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/36268387577.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/zuritatovij.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/30861938618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=2016+chevrolet+cruze+lt+manual+sedanPDF 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_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 20900 bytes
SHA-256: 8ff8a1275988ad384adb30ed2d29c984e703b7099ad3043d23c160a1c3eaef01
font_01_sfnt_off0001522d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522D 11132 bytes
SHA-256: 1313ca5fedd4b403453d1ef9994f9e3f54f046180921668500cae97db40327e4
font_02_sfnt_off00016c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1