Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0fcf7d52f2d513…

MALICIOUS

PDF

91.5 KB Created: 2021-08-20 01:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fc5c71ca593217cc6bbc7cc8bc15b16 SHA-1: 67cd0f389ed1348ac9d9719e0bcbd34014ed2052 SHA-256: 9a0fcf7d52f2d513afc517bf36ca5f7fb77c23f6189ce3aadc0c6b7bcac1587f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=easystand+5000+series+manual PDF link annotation
    • https://schlosshotel-murten.ch/userfiles/files/86796582826.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/nugupibuvezu.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/91585520320.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/sogukamesupisopivirosov.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc112203a5---54676913149.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75c88cb7dc22388e315edc3c787bf281/nusibanufexewofevo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff866eae7---7058560916.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/015dd8902e42b2cd53a8992b13ffa365/6126464837.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a492ab2307f---52720299877.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/fudiwefosanukagel.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45521944222.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ae1ccc42---49187336902.pdfIn PDF document text
    • https://actorconseil.com/files/file/rolovowem.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a88a27c3f---teziwumuvazajusabu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9e5f6fad37aa4662d4eb2372bf79fef8/92474374784.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160783cd8a8b84---40664274423.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/93589468092.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/rewarudagusoxuwad.pdfIn PDF document text
    • http://axwelindia.com/uploads/90006709967.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210717230154.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/kf1kgsvr43j5c873h9hq98mbr4/45103409870.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/60596942282.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/48069625950.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/luwigoreponikisururo.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_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 10740 bytes
SHA-256: 25068e3352146ec5dbe74f9ae408cc77ec1f75131214693f11a1994ad4d92c51
font_01_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 17960 bytes
SHA-256: 6078b666566c910898facf086919eb48b7b49955b78d313f25a39fcb576d8a1f

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