Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba08b876423773a…

MALICIOUS

PDF

94.9 KB Created: 2021-08-11 13:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8df51f5f5fb94da103edafb7e1dc7d84 SHA-1: 0993e3b423634ea7436ecb579587ac32babe50ac SHA-256: 0ba08b876423773a5954e6ee9b97e398b5384d750abfab4407e6f71595834821
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. The presence of multiple links on potentially compromised CMS uploads suggests a tactic to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/uplcv?utm_term=astm+e2500+20+pdf PDF link annotation
    • http://www.amedna.com/userfiles/files/kukakugefafox.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45305672d---97032215080.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f88b12f2412---18748027161.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/83356444112.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942014b1c0a---1031206152.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5aaf767a7c43f3cd6c0a1244803cecc8/76663301904.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094029280221---96505818967.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/12696b2c545fdb82ef873b49da2c3e98/tupifoga.pdfIn PDF document text
    • http://brukbet.com/user_images/file/57077701863.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/domogureg.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/52802290628.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/zejaluxitipazesudipet.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077de35a04be---litonomesum.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/remenexagowojo.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/wikiso.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2ee7796e---22855435537.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/19260422009.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d40fcabf2---9739862078.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/jovavovivazirenoxarutefal.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/mobofo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd187b728c---61294956205.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/guritakudotaxasulixuwulid.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_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 19048 bytes
SHA-256: 789d624120f2497b3d068e38e6689e269c19812dae1841dfe5dd44c4607394ca
font_01_sfnt_off00013cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF1 10392 bytes
SHA-256: 96122c8e67a6aa98f4e1323fba1962f43ac46654124c74d9d94ade45f689ad2c
font_02_sfnt_off000154a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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