Malicious PDF — malware analysis report

Static analysis result for SHA-256 c174acaf121e198d…

MALICIOUS

PDF

99.8 KB Created: 2021-09-16 08:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20f231187a021e9e234e53e3ecf88501 SHA-1: 2762463663fd5b11fc1d2c15ede9178f3f3580c3 SHA-256: c174acaf121e198dbfb98e27154785226cda29da7bc7e9220473d5224f42b706
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, some pointing to compromised CMS uploads, suggesting an attempt to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic strongly indicates a callback phishing or tech-support scam pattern, where users are prompted to call a number for a fabricated issue. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://sklepbonus.pl/userfiles/file/44502959980.pdf In PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/79991998164.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/riwiteridobokepolorujexav.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210902211409.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/sinutolunititajupex.pdfIn PDF document text
    • http://merwepizza.com/upload/file/33129102771.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/2353069814.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/98836145054.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8b2718620eda1cc30cacd5bc8a379cf1/lezaborinepe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6886db26---bugomumagafafinuvi.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/wofixesakelinuluzujezi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e7ed3796eb878a508faca090716aedf5/zenuluvojiwefuda.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/6128703500.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/visunogizebawomagemoruko.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/vagizisawup.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/lafekanu.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/10484239916.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/podalotari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+payment+gatewayPDF 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_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C2 10704 bytes
SHA-256: 04475680efe07963d2ae184af46100cff7be19c5deee8fffd022990ddca285cf
font_02_sfnt_off00015027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15027 18980 bytes
SHA-256: 5b760d8d06884ba23b1aa66c6cbb6036ef541e1232c66e887ca03606a5935038

Open this report in the interactive analyzer, or submit your own file for analysis.