Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ea989d6d83390c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 08:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1494163fadf6a2b61c2d2d9f99ab5f35 SHA-1: 9da4352966999a4fe50fc71376c2c70c32b48659 SHA-256: 90ea989d6d83390c6c7cbd75baceae7b0fe45dcc44831ad76a9738a563ed2ce0
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a social engineering attack aimed at tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=apk+granny+2 PDF link annotation
    • http://tangneylaw.com/admin/images/file/63040608271.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff9deed06---1049913343.pdfIn PDF document text
    • http://esangsok.com/upfile/files/4671958716.pdfIn PDF document text
    • http://esejsc.com/upload/files/pisovopenetexekisapodumab.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapamewomexowu.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/70284192764.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/94562276220.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/bogidodibitukifawekad.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5a6eb9d2---gozefuvabisototut.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/25059459558.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/90616647751.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/79127972001.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/12708849922.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/46121672739.pdfIn PDF document text
    • http://sissonne.hu/editor_up/40298360660.pdfIn PDF document text
    • https://eetravel.net/file/ladadis.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/mebuvimusikoverufu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7cb867b66a8328f6d3b3321b6cc23e59/tevivufegotubi.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/20879944598.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147daaee2799---viwijivoliwojaju.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4ef8daa3---97141008554.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161316a117b43a---wuwit.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/wijewimofiwaruwo.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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 17732 bytes
SHA-256: 14e44150f3352f6ed69742ca91888d6c052646d629445e76c8935ce4083c266a
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 10076 bytes
SHA-256: 454b788deb94f9b2cc5d633cf3c8ac43bc4f5de85b72b1acf3a77543d536e627

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