Malicious PDF — malware analysis report

Static analysis result for SHA-256 95757f4173b9823a…

MALICIOUS

PDF

91.5 KB Created: 2021-08-04 08:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 808ee9060c9f2a2258983e0762c6956b SHA-1: 43f04a8726de8134844d6d2e0fc188c0757304d0 SHA-256: 95757f4173b9823a354987f1ba5cc69ee211b6c61d9e7fa93e511036cf69f3d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

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 https://pixomot.ru/uplcv?utm_term=why+can%27t+you+chew+tobacco+before+surgery PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7cd259383---lasogodobejomafawegaxidi.pdfIn PDF document text
    • https://mavibusiness.it/file/78096518540.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/12184589828.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/mopoza.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c894ea877b---tifusugojevefekisadilewal.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63a44ae39---79136309415.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/94212057506.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/55821640394.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f1b9b3ae9deb5ce8165f168d13ed624e/53401628268.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t0phl541971oss2rhi8bmh3fdr/65109180334.pdfIn PDF document text
    • http://yuha.be/_files/file/nomununetodebutudo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608084219987f---bukovubexomorerofimof.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fejuzojazavikoxamukabemod.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/21555553593.pdfIn PDF document text
    • http://fullx.net/files/lojegakepaxaju.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/62233014373.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/44918357238.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/gunowovav.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lobudajeperudagikotaka.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054706054---kokaputifatonufojivibe.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4871265d5b---sifinosewodowotupideji.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/457eb94b9e91f2aeeac0702646222dfe/7071593548.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/32d9dc2f27f2fe0864154b2355bdac6f/75241300872.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_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 10944 bytes
SHA-256: 9fe33b5b3ae95649a4ac3677d06a7c9d12d17cda3cc53a7f33476b28f2dcf9b8
font_01_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 17200 bytes
SHA-256: 73c76f0fb68e62bb98e3ec84d52539e5dce85bd1656b117b867b612067c724fb
font_02_sfnt_off000146fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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