Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bcce5627ef41ca…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 13:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d3e732bd146f59c6b5359b0c8af4e2e SHA-1: 38af291d69edc63810b977ab3b480ae38da3b58e SHA-256: e6bcce5627ef41ca9414bbc13d8ef05a883a0f09f3285192c0828ccf1bf64981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or trojan activity. The presence of external URI links and link farm heuristics points towards an attempt to drive traffic to malicious sites for payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=pokemon+go%2B%2B+install PDF link annotation
    • http://xlith.com/userfiles/files/zusugat.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5a1ae13d81bc91f7eb5e4dc3a745362e/vapikevepojige.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/89457173346.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/delokudarajaxuxepam.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/busirapudawinibakanizivub.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/dumozazuruvuwikipujigajoz.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pagaderoso.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/wojiwusobipakofegefemadap.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/90500965946.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161470d9fca82d---92549951780.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9c570935---judipozifiwupujepigipurop.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/gidekagugu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f0a7319ded652d39dd5c2e5b512f41e4/nonavezagatul.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/10016347859.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/bidow.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d45aaf1e4d---3544465820.pdfIn PDF document text
    • http://perksys.com/userfiles/file/vuxowemeliforawanuto.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/tavezapoluze.pdfIn PDF document text
    • http://placc.info/up_image/35661504787.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210905210408.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/sopebelodixarapanaxebijov.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f29f306f11c6f90a065dc1ab3f363c0c/72464047025.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/26c06df668929ba07bf379d420e6a404/92878490508.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_off0000b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28B 10444 bytes
SHA-256: c446a213a1e5f6b3ec49c025efd55d8380cd1b30cb14062e68d42b28063c2a2d
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 16608 bytes
SHA-256: 259973f477916838e4ee3805544ada2a96c81921f94684ef80e03e0b7b15f346
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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