Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7f340e3f9c6111…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 10:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b88707dd044b44e08816de3c5eee9187 SHA-1: ecef62ebb6524bab5068408c83456b246735bf4f SHA-256: 3c7f340e3f9c6111e7f9901a46fdfe28801bc4de6ffcfa64b3ac39ca34789621
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=cute+big+houses+in+bloxburg PDF link annotation
    • https://perfecthospitals.org/FCKeditor/file/88264372807.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/27262525894.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384622e7e20---42173686013.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wujekivogodobudoduni.pdfIn PDF document text
    • http://boxethai38.com/upload/file/tejukojimenerezokojodovim.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/kiliraximutafori.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5f40f8c7---30759802345.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/58893444665.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/82964932666.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/gadusat.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/pukivesobomuzedexas.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/59472907184.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/74cb68a200fb8d5afa1467929bbfa589/72267929103.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/6388953486.pdfIn PDF document text
    • http://stl-hk.net/userfiles/21015351562.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613599aa4c6f7---namupelakijasage.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/73261992788.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/015303aab170a41d0997fd2960b18571/59186174310.pdfIn PDF document text
    • http://adriennemason.com/assets/files/50669640660.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/51561746656.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/69460777521.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139773d38cef---73598569168.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/bemotimaxavunanujafage.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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 18128 bytes
SHA-256: a7f654d0a10ab0f6dcc2ce1cb3e2d6a4eb166c2e72253d2d0866b3873b718f77
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 10600 bytes
SHA-256: c0888c5b01e13ae37be6da4ddf9661ac3ce2b6ecb9fba3487a8a3dd590ab4edf
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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