Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26d28e2ac354ad7…

MALICIOUS

PDF

91.8 KB Created: 2021-09-05 11:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b33e42517c9bbdd7ed3268583e7641af SHA-1: 44a7f472aff56975d59331d88143ade6f865a77b SHA-256: a26d28e2ac354ad7ac2c40f5311a73c40a1dc394b2695a9e5b8cfb7e2617308f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm detection rules further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pozitron-s.ru/userfiles/file/81606090223.pdf In PDF document text
    • http://haiannweb.com/uploads/files/kowozuwosonunadexiwido.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/51466426207.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160eff86bc9101---72377976193.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zivomugabu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074976a60627---kezamusekil.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d8d9b5902---75199921666.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/juzonuxatajategijuw.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db45afbfb---vesimazipitirata.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/79679315353.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86c3420ad6---4243976067.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608c46b91fe9b---95514963031.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/taser.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/6011916827.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/tefawepi.pdfIn PDF document text
    • http://robedecreateur.com/img/files/97235392733.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/mumevubadavukukof.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/55269375910.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b609c88ee9a---suvarifafajonuxozi.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/82027805350.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/bizivuzobumikamerozu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/affa16790410d1a12d314e13ea88ba69/sidurodofavemikam.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u7havgs3vd98hn0sfa4esl0rga/marorinixenasuguxibubudu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e004ba1435---bijarejape.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fortand0oi8ckunefmcpr2n6da/naworivuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fix+pdf+icon+windows+10PDF 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_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 18756 bytes
SHA-256: c14cb741186fc76787240f47b91a4d65485c0eaa49288e323b0eecf7aa8e031a
font_02_sfnt_off000149ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AC 10412 bytes
SHA-256: 955a97959dc278ac89f7447c6ad5812ab02febfef5cc1b3d90f75800fc001288

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