Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62cf1a01c628578…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 13:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1ffdc61ed691931fe116a874fb98fe0 SHA-1: 549648640309af9b7d4278f7d68b068c6732e0f3 SHA-256: f62cf1a01c62857851ab04852cd547fc1aedc394fd7e6ae2afa572f3a64337a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The PDF's structure and embedded links suggest it is designed to lead users to phishing sites or download further malicious content.

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=gestures+for+android PDF link annotation
    • http://hyunshin.net/userfiles/file/naxux.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/46484931845.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efcc50d451---sadajofogisejedibazumar.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/50540263450.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/zavojukotuxa.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/10860636119.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/6022784354.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/80235375070.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/27553479511.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/gubawi.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/zuzokerupasodanedez.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/49586591312.pdfIn PDF document text
    • http://brenderup.ro/mm/file/semezolefikunamojoxutelof.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/81360239757.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/41549128703.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ecc14be0f---xakudezezorow.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398646b8b27---lusef.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/farolimitunonisapiwolixeg.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/91737063807.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/gaxegufusazolox.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/jawotunarudigobo.pdfIn PDF document text
    • http://cutskytools.com/d/files/luzopakemixuxitovo.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109101634071649.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/59039295243.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/gefitawibew.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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 10440 bytes
SHA-256: df3d8388815a341c105c04435c914e6759bbbb189d3d35fb444e1597deb9cc45
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 18224 bytes
SHA-256: 6d52229bbfd02d4fa46b64a4feac934fd2b88931506ca6ce0096f3b7f13e9402
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1