Malicious PDF — malware analysis report

Static analysis result for SHA-256 29eb8104fb79e82c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 15:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a11f09876adc560152b6cfcb288415b1 SHA-1: 5e6c23a292d925b2870bd2a4d43d3d11ff2852a5 SHA-256: 29eb8104fb79e82cce31ea1f294e520f3fc07221f71b84bc7d3e06f3030a9737
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

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 http://pro-group.ru/userfiles/files/wurenodibilus.pdf In PDF document text
    • https://mangonebike.com/uploads/file/67499116153.pdfIn PDF document text
    • https://forumsevens.com/images/file/99218775654.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/jumuzib.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/2695590585.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/91795433983.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/vugufadupujaxuleginosa.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210918_ECAD4B1ACA3B2C5F.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/38886380217.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f0e5bb69---79203505874.pdfIn PDF document text
    • https://12tiga.com/contents/files/82352850850.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/jujafitulofopukoxo.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/firajivimuwir.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/baluxasonoxujiziges.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b333fe1c49---pejorerolejaba.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ae19c66c---zusadirudesedanusokivez.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/guvaw.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/duvojidivilawosewesonikib.pdfIn PDF document text
    • http://tfforming.ru/d/files/93898000393.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/sojusanipomuriluzesifaw.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109121026366884.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/44943859953.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/dokuzexijarasujidifosilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=won+tv+plus+firestickPDF 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_off0000b31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 17932 bytes
SHA-256: 47511b90190a743d743f885500556307f96161d646822b5cebdb2bd4bf029b8c
font_02_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10560 bytes
SHA-256: 45af379ecef423a25bc91698bf6e14e21c82757a5f49d82f8e38711f1f9424ff

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