Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc05e2f23bde93c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 19:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec5f1ef0fec0e5f5374981d059000033 SHA-1: e3cd576ab3e76d4cecafbeece714e6077dda0a58 SHA-256: 6bc05e2f23bde93c6d5578ec198ad43ffbc9c8a2eae5b017c2f8712a90765fea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised or disposable domains. Heuristics indicate this is a link farm, likely intended to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=crazy+rich+asians+free+online+movie PDF link annotation
    • https://hamasataccessories.com/userfiles/files/jakezubewazomulanetokof.pdfIn PDF document text
    • http://usagimatur.com/files/others/talekebukitox.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/jusunopewuxipilutazoxo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/bukimaroparaxosolijoxa.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/18692221708.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161494df1351fa---neverenekiwuzonefanev.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/bijofu.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/60653732513.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/tixizitope.pdfIn PDF document text
    • http://health-bridge.in/upload/file/50445071376.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/pavejabozufikugemabu.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/nisomulasidexuvixe.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614507b82ce8f---foxivevopi.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/81631218446.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/70999929870.pdfIn PDF document text
    • https://partnermind.cz/images/files/tuvudugevarekazanire.pdfIn PDF document text
    • http://luatkhangthai.vn/upload/fck/file/1936294334.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/18329558784.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/164456582.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/83820901637.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16147314d1bf63---2014996487.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mugufusozaga.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/wiwiwe.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///31719592858.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/boboxuru.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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 17968 bytes
SHA-256: bc29efe24dba05807ca2e134c3eeb8ed39564fa0c251aa47788e8886351bbfd2
font_01_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 10776 bytes
SHA-256: ad6d20ea0bf56498c1a209bddddc38112d2c85bfac5d02928160637744a73692
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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