Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c4d9181254002b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 10:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4215c1cd399f1fa5c407d2d5ad768620 SHA-1: bfbc62b323234950765b6dcb3c96fe2bf75f8fdf SHA-256: 89c4d9181254002b8c070ac1c44783ed97224281df27a479d671e41e4cbd6fb2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to malicious content. The primary IOC is the URL used for redirection, which is part of a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://nomylo.ru/uplcv?utm_term=view+instagram+profile+hd PDF link annotation
    • http://solarexperten.ch/fckeditor/editor/images/file/53976334255.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210914_A2A7295DCA3629FD.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109070720364165.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/vavefosapomaraterivu.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/32666694986.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1d49ee9e---96950082915.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071749421009.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/19386328367.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/84927625594.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/redawenisiruxilosizusabi.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/ladebusokamodudod.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e81655712---58671369606.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/72277166023.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/333t27mmqb38e2001agk8ahnu8/5192570209.pdfIn PDF document text
    • http://chinalabware.net/d/files/53554750435.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/biwudar.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/boreligavebufazejof.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/60445544321.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132658d9f997---lobewasifejobiraziwupisak.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210906093229.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/33288403733.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3q7fge7fbjlitbpmroqll8l17p/bufor.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad2d251ab---lorefuxotamutivini.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210905054519.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/72038161032.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/popowopunenum.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_off0000bdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEE 16060 bytes
SHA-256: 6b766d111576efc35d2d29f571110133c061a121cd9b340ff064679622f2dceb
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 11000 bytes
SHA-256: 4fb3dead68b3c9b96d2fbb81125bd5ac504c5f02c098e5e4175932d4521bc2bd

Open this report in the interactive analyzer, or submit your own file for analysis.