Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53de569aa9ce140…

MALICIOUS

PDF

82.0 KB Created: 2021-08-16 04:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e699dff73f3b19183d06aeef0fe865b SHA-1: 935868f5b879beeae33f40d498b0e2c5debc7f8c SHA-256: f53de569aa9ce1406d58018bc97cdea94b7e13fbebdc8c8e0b23639fff181623
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress upload sites and disposable hosting domains. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to prompt the user to make a phone call, consistent with callback phishing or tech-support scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/kj99gl6c6d0se3t5r7o7pne9vj/keguwitikawotuwiwinefikes.pdf In PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a9f5a756---78050798586.pdfIn PDF document text
    • http://belovosushi.ru/files/xemuriseniwixumatomi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/15210656919.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ea4329c38161928bca56ea6d7ed4e916/88083393828.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/62587330138.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/to3tu652n5s5n19nr3cvvg1g62/vokeri.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d4c7eae8---59178940816.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/17527912435.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cd159536---81424397375.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0ea6eebcc3c6f2617290d9921448e527/fuvaxutozukiviteb.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/68621950829.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc346bfb9---bawuluxaja.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/fonusepunotalajezi.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/fetenurugigaferajovadoku.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0619668a9c83e8a60d3a6702f66c9cb2/xomoxuzoku.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6e2844a8---novabixunewomi.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/kilogoxijufala.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/56590383721.pdfIn PDF document text
    • http://freewest.at/98937447959.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9e1af4bda3bb4431d0c1cc3211638921/75642971427.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sokipuxuk.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/kujiret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mass+of+light+lenten+gospel+acclamation+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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 10960 bytes
SHA-256: 4351ec509a80f886345c5a2a19f0fd88f7f055b744f05d0a95bc693c4b28ec10
font_02_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 17148 bytes
SHA-256: 85ead14c627bd56f45c51c107b85a3886c2a399b296e55443a4d849891c709c4