Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bccf190454f3ef…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 03:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c15382bf6c129249c1946a71ba17cac3 SHA-1: 7033bc85ae9af884cbb1569f5c68e137b3692fa6 SHA-256: b0bccf190454f3eff561edf1a3f835d0882fcbc5d2010069dc05566aeba2e305
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=surah+al+waqiah+pdf+rumi PDF link annotation
    • http://firanywiktoria.pl/uploads/editor/file/54332880320.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/80272968636.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e4dd3223---50299340047.pdfIn PDF document text
    • http://bushurov.ru/images/files/11099935892.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210825052240.pdfIn PDF document text
    • http://potlista.com/file/files/guxabamufewatuzidinimu.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/49519913080.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/vibozavilebupekoxikazu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/tusom.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c808d8ae06---vopigi.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/7106645793.pdfIn PDF document text
    • http://polletnv.be/uploads/files/17024397827.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092234fa342d---31203393671.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/29074283533.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4sqtegrshqcuccu520sgrsodh6/28205381745.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9ime7i2erhigng365g3p73vs75/6101286581.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134765ea7020---zositag.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/dulowemumapemosumufedo.pdfIn PDF document text
    • http://flomojapan.com/upload/files/zopegutatazuwakosuzibo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092efe56e365---69786237013.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/59081580393.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d4d46e04---nozanexawomunaluki.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160939f74784a8---felojurejaw.pdfIn PDF document text
    • http://na3.it/misc/file/dagabusus.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/48430894897.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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 10548 bytes
SHA-256: defdf618b1b689b6f1741230376bb00985cd4862c623fb58dc5f0f15acedb657
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 18148 bytes
SHA-256: 7e0db93c6edab2229888490d4e675e2d3089581a6b5a199cf47e49b3d9e17d95

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