Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63f608b273702db…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 14:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 079d725b533a0dff3eb9353c1626a0f2 SHA-1: 4afc4d076360cafd43ff6cfe1a1d1af792e2957b SHA-256: d63f608b273702db5184d0ba227ed2e179dc88c5d85bf6647d2072d4c47e2cc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of `utm_term` parameters in some URLs suggests a phishing or SEO-based lure to trick users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pistant.ru/uplcv?utm_term=win8+1+64+bit+product+key PDF link annotation
    • http://studioguidobarbieri.it/userfiles/files/wonimakatiwokesiwirowiwal.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be7d1b9ba---55137063826.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/83430376551.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/xeladidozelebi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/sulegugaxorogosuf.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/kavademijowinez.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/77612654958.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/fazirujunebonatomuwa.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/8378329903.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/zorirerotijifogumafunezox.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/sifinijetanupedunote.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63ce4e2f1---wezarijadozaxi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fae7434b010d2b4c42701eb740a2978/56493983781.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137af643f125---bivap.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/75546236197.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/fajad.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9ca9abcc1e6e625341e5088e9f12577e/kututofu.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/31335406231.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/kisasapizixorimojididaw.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/67397679885.pdfIn PDF document text
    • https://afma.pt/site/upload/file/wikuwaverorakatokinaga.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_off0000b20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 11076 bytes
SHA-256: 264e6d7d95209b677c54ef220e4dd22e534253ab8217ad877a2804afcdbb3598
font_02_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 17812 bytes
SHA-256: 9b71ea2c5ed980df6f6d33fac8dadfd28cb4e3b2866033ffb32cb57256fc08dd

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