Malicious PDF — malware analysis report

Static analysis result for SHA-256 b675290891812c37…

MALICIOUS

PDF

71.9 KB Created: 2021-08-29 23:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25ce87a62c94838b018d1eae864c877b SHA-1: 77a7f53e75f8ab29cba09b30da5b39341875f4db SHA-256: b675290891812c3702a08b140f7b52d862cdaba71081fdc9e20133171627aa77
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers confirm its malicious nature, likely serving as a phishing or malware distribution vector. The file's structure and link farm behavior suggest it's intended to lure users into visiting potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://guides2alpes.fr/uploads/file/memoweraxix.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dcd4335fa1---62162638679.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/wugudetodonazolisisapived.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b86a8eeb2---xudalenonuk.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e902f7ce8a51a22e2202705cf72df583/90353260875.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082519c23211---soketerovekegimim.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/gifafawaligejeko.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5306ce82f---nobuliwexuzeviri.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4d3957d6fa2b1cfa24527185c8825001/25463204804.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b989074a3---sifomuxoponebibisa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16110dc0d849d1---gidanolevetibosat.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/vofew.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/86a9ca0e8fc49020e1774e9ecc170309/31194933462.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f638fa25638---wadowusuligirikewevajir.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bed32147b---8809570145.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021514112545306.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/zojarukulan.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/rekuzemotifarikarulu.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/genixa.pdfIn PDF document text
    • https://atrax.hr/files/bizifeverijezafa.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zolutavatunesixab.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/svorpbp7lljcsk5lb4ueradi20/86031146083.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/b5cd10016d65df9696ff5f9ee63a28b6/nuxawuvofemuzejajujis.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/94096894486.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1c9150c22239d2ca79d9eaf1c8676fc8/duburunapajomemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=toxocara+canis+roundwormPDF 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_off0000bb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB13 10504 bytes
SHA-256: dfe3c1b39a9e2fb48f7f7d0cbf59f258055abb730d079c8d0b0f7f532cc1e7f7
font_01_sfnt_off0000d300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 15224 bytes
SHA-256: c01083c5790e021eb7b4b7091dd528ac93bfd130bf02c45f2a9c828df57d5601

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