Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6715103e74be80…

MALICIOUS

PDF

81.1 KB Created: 2021-07-17 05:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4797c5d19ddb22f32a48f2f2c164081 SHA-1: 32c4dd769c21c7116f912faaf1c13cb72da3c632 SHA-256: 3d6715103e74be8091f33e88640aa3bf0445fc40d53540eafce802589e996f70
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user interaction goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jokerprod.net/userfiles/file/zetudagijivarobegozi.pdf In PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/2c97a15c9c8b9f341a26d331ff5499da/zazowabekekefifewaw.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5d9a7da93d43eef86629ac84ff6aba05/30075196695.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/finewipate.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094b78b83141---lujajopusogunoxe.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/46044104513.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085011d8f018---vakamexugiwipibebisoputub.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabbc15a85---xokerisuxinafukujixebuxos.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f73bc2f778153d3ea784d8c07345ab92/56923410783.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/4319c3739f048cce54ca585662e4caf7/tabenajezozuwak.pdfIn PDF document text
    • http://allycatering.com/userfiles/losokijepuwelagadulurewom.pdfIn PDF document text
    • http://azizolace.cz/images/file/39880412562.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b4c2d25fofuplco38v4kima6i9/futalokukosit.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/756f888bd2f4d21013e8e6df204ab20c/70249648991.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7589f5603bfdfb32d384f261bfa4142a/wimotojedezuximamo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/59d774c7513480f87fd49fa07bb6d501/24739119940.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d4193d75---bezevamuku.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/edc39fb6cd0e4835f04b8ab1867bed63/sunazemox.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/gbktnjlh32vab2871ud6jnk047/kojetelipajodigeli.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/tupexotuladofizovepukubul.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/29643617218.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/15794495709.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/186958144.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/709f095e6cee3701efbe1d2b62a8c9ca/taruzudefizolokadudawif.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/34498945439.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/57864382491.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/qectdaif1rv9d6etfl4enq1jr1/52823313450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=piano+chords+for+hey+judePDF link annotation
    • 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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 17292 bytes
SHA-256: 7bfcc6a9dfc9dcde7499338e49dce48d3948e0893f71a0923b98d880369cd3ca
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 10772 bytes
SHA-256: 5a1c0b6a098884e0db924f0ef4f0c25cde91f49568778437269f83b91bdb5b6f

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