Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75682270cb8e519…

MALICIOUS

PDF

91.5 KB Created: 2021-08-12 20:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93dd6857f5d00838737110ef7d7007f7 SHA-1: 2cf4431cbc28419b0f6a003d1ee76fdeb79dbfe4 SHA-256: d75682270cb8e519e9d1a869f16e1b17af06c0625a06002b7fbad88996e3ea8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=the+red+umbrella+summary PDF link annotation
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c303bd14498---18615949671.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/vufoxulusugamemapike.pdfIn PDF document text
    • http://seamacros.com/upload/file/81162207866.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/85019726502.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8818ce99ac4ac8d3631335b4714dd036/60670764432.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/h8o5g8rh82o8arn6u6hsdigf7u/nixobanipuwexemag.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/afaf92e682fa922175a0dab057ecf9fd/47912211874.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/28517247177.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/kujawimulomuxuzetomaber.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/bakipumiwinodofi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5251dbd77a---gaxidelikixow.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5l8h59gg96o7kqhq11qegq9l85/kisuzuki.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/zenafetijumukenovo.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/tugalomaberazokifis.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0ce76a92---femuninerazoxavax.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c347b855e---79310539432.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/454bbb917008e12de55647750b734d30/ledesutixage.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2cd457b352e6f3dad73d96c0ed9265ee/laden.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/bd9c22f79a68c6bf073bcbae577829d9/65121081814.pdfIn PDF document text
    • http://renovator.cz/files/file/wobawulesadugeto.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f171c51e41fc7ab23ab57031aa2a094b/74432503232.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/dupezirula.pdfIn PDF document text
    • https://ekransamara.ru/files/58922637051.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/88630949628.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b296c901---51265044221.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/57139571750.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_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 10416 bytes
SHA-256: 1893afa38cd41b06a1ee790b49af6be0fdc8105ea646ee960fb050fc9f58c069
font_01_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001338c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338C 17004 bytes
SHA-256: faca469c1f0b082f9163cc682dc6c49055167b7e82724f9c4c08e3d774a9e661

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