Malicious PDF — malware analysis report

Static analysis result for SHA-256 75528378c406b69c…

MALICIOUS

PDF

86.5 KB Created: 2021-07-04 05:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3865238f5174271be6d7537abdea0fb SHA-1: ef216b3cc76160c8fbb445b2cee48ed89dbbbffb SHA-256: 75528378c406b69c49ff620d4ef0f378382f3f349a8e4083c2895df49d8b0ccf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=average+cost+of+facelift PDF link annotation
    • http://haus-st-otmar.ch/userfiles/files/97428162430.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/9886922597.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1e3ea1afbbf3a2361c0a2615ba224342/47629607417.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/614667814.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/69849891368.pdfIn PDF document text
    • http://charivne.info/images/file/21865958844.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae3b6ce47---3684480123.pdfIn PDF document text
    • http://oklogistic.lv/upload/file/xebavujudibirutizusujipu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbd9rrpac9h8nccilf77fcc5c0/18177265097.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/gizozabirabu.pdfIn PDF document text
    • http://prosquash.by/data/85064509224.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89b4704f6ac4a21111e7dc3e1f65b31d/57444813118.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e87098db---48068221608.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/48123403117.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/92338138905.pdfIn PDF document text
    • http://matras-devison.com/upload/file/tuxuvereniduxovusudojoz.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb821a55d2---maxuzanuze.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10c411e8a---83491176147.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d00bc793---4871787815.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/68ff8c2de4a8b3fc2fd601c55f731158/wazebanuxobebunedorejub.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qqmihavi1tt4137f84qtllhu8r/pujulivulomuvavuz.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/rowel.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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10452 bytes
SHA-256: c570001b64d1366d984ed63103a0816e4e60e97b11066ab5e522a1f081fa1ddf
font_01_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 17036 bytes
SHA-256: a67758d7bf1dc2d574e72076962b029267370a697f03d6c0fafae39934d76e5f
font_02_sfnt_off00013506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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