Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c340203ee23e07…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 17:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9cb36db9a047e8b45dbb2660a63de430 SHA-1: 8e8f5c363dace4f3b5671a9eb8116e29f42006f0 SHA-256: 98c340203ee23e077693ebde79aef48a17c984aa1ec8662201612b0485be3d42
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' heuristic further suggests a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely for distributing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://zespolbahamas.pl/zdjecia/file/29456874258.pdf In PDF document text
    • https://lawina-radom.pl/files/file/14609877181.pdfIn PDF document text
    • https://promise-land.com/upload/file/lawulamixe.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/61116083379.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/kikuk.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/mebuviwep.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/24669504794.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/53481199324.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/pafilejazukotet.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/65938102926.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/xubetebedigubexuvadekijo.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/37457331357.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe922b74c---14696384130.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d97338b8812f29e6f4f1c7d2e271a55c/45790809473.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/lurusomegonugegokuzuj.pdfIn PDF document text
    • http://tai-group.com/upload/files/vatotulijavi.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/nofividu.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/rudixa.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/96629838946.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-14/20210914114728665453.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049449941e---gevuw.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/lodafux.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b84a144b62---51466806731.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/79857007460.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/74277399936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=where+is+my+phone+companionPDF 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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 10600 bytes
SHA-256: 5428b60ccda7d0f71c46b0d52f87b508d9c70497c571452b3a224a05c2b62d42
font_01_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 17336 bytes
SHA-256: 15e6c84afbc8ebb6e520a38db26898230d7bf1547de985224fa768adf5d5e595
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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