Malicious PDF — malware analysis report

Static analysis result for SHA-256 0055d036336c2732…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 03:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a326b3a1698e40a4457842febc297b50 SHA-1: ef069f30176f9a40001f5913165748785a2f3c7e SHA-256: 0055d036336c273246ce1bd4bb1301dcec630ac26141d958e636ef64eaf3c01a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's intended to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://autoandtruckrepair.net/nbloom/fckuploads/file/15975634187.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548358590d---vetasotixofenuxibu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073db1f70ac6---gazinage.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/83710360580.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/wemexunej.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/xovasif.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cad88dcc8e4---sokigokatifemoxarebozev.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a0d5633a7daed205f845f908b487dc5/26057971590.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a41285d99---ruzubanukukaxuvur.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/cqed32ciddgqcqhs9ne2sh58tn/3775238774.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092314a0617d---wezoxemem.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081d556efc04---sagebu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2624bdaaa34239ec79a2668c1fd14ac5/75294384527.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1c28c348ae850e9c54a7aed64ff01a4e/26814007253.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/90777340629.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/gomaxilozele.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97d6f11d1f---jitez.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/58074315970.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd99eb5e4---4602164223.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/30c208f6876ad50c0b24ac891ebc1e8c/zetodezetopipi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5f5d49ad28880ea9f91b8836ec72e9fc/69811274323.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8nnruhg3o6l81142a1i7049lp5/366046398.pdfIn PDF document text
    • http://nessium.net/userfiles/file/sopezilexavik.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/janafilusaz.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4d34120c7fd46b6e40e89f5be8ee95c/12485844851.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4db033888499498b52e8b372bec97edb/64386910292.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/jelolemam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=military+heritage+musketsPDF 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_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16836 bytes
SHA-256: 3e7487ecca3bccf81d5d9d1321167804a99ea1600962a21814172b344294cda6
font_01_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 10632 bytes
SHA-256: 8d2dfc61b2f70d3ea353fed545f0dd09ab97bc5a7ac4d4f305b07fb190a5a197
font_02_sfnt_off00013bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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