Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0699848bc05b1c…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 10:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f57b25be94dab168f9f4692a84e5f708 SHA-1: 14f927a44f905b6bdd48016e11b87afb4bbe5ec3 SHA-256: 4d0699848bc05b1c8ce7ecf3b4fcc197733268f67326503fbba22c70de299a43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • 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://crewmak.ru/uplcv?utm_term=scroll+saw+projects+free+pdf PDF link annotation
    • http://giasuminhtam.com/Images_upload/files/10458926040.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/98939857546.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2cccf18---30397912527.pdfIn PDF document text
    • https://hgb.se/filer/file/jigusa.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/dubobifitesenisunoniti.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/13837425070.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/64142880115.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a98425e6a---xesizagepefanebux.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133610c3b86a---25033187151.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/buvogujanusobowuxato.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/bafujitujoka.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/lenadilorivujujagelen.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1528889b---77124454632.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16147382670467---fixadifaserekusovufinoxot.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/46377182150.pdfIn PDF document text
    • http://manu-transport.com/documents/file/keziritiwur.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/41079578111.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/59456445377.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/67810713347.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/97602772836.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/1431607135.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///walow.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/90659965255.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/17247788202.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210929050704_nsvzca.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/wevoxepaxiwe.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_off0000b150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 14880 bytes
SHA-256: 7eab26477c40a99725cfdf3ddc1c8937f2ef1fc8313efbc9733d8f541a01b4c7
font_02_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10708 bytes
SHA-256: 079a717b06173fd7d4abf75cbc431a1ea5e799881e6a80cad03de3acf56b9569

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