Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb0ce7b1576f559…

MALICIOUS

PDF

95.3 KB Created: 2021-08-11 21:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63cbb404f34d5e202f7885db75bfc050 SHA-1: fd74d83d59fea2e99926412e422019ffb72f126c SHA-256: dcb0ce7b1576f5593afac5f5a3dcc622e14bbc7a0f618589367ae04e517436c9
176 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it functions as a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing operations.

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://synerhu.ru/uplcv?utm_term=la+palabra+poker+es+aguda+llana+o+esdr%C3%BAjula PDF link annotation
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4cea7353a97330d5b58854982663b062/52317265467.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/40859260372.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba14366b3---kawewezifore.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609861adca8ca---somafepuvoxugunevejedake.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/tuwusowamodopajomu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3217f5a9---fijuwiliro.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/dukefa.pdfIn PDF document text
    • https://menu2uplus.com/images/file/11736001427.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/gorasigitibi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef427fe2a---57738602470.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/1754450793.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/63185658033.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181ef20373---bizezazijinizapoduw.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/texemixilulodobuna.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088abb63264b---miroxoraxilosetuwet.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/25571997976.pdfIn PDF document text
    • http://k1a.ru/images/files/file/mejugufene.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8093512e2---33061658956.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19428993082.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadce97ada---99189242616.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/9295080355.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b86943963e8071b242e509cf10998da/74055198039.pdfIn PDF document text
    • 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_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 10912 bytes
SHA-256: e382ce57c7831761cbf447c0a8cc9edc84a6b752ea4228de41f84d36405f27c2
font_01_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F32 18204 bytes
SHA-256: 3cf5171e698adbb0831048e35d3e3be47fe2ad3a1ad468a2c324018b61518d4c

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