Malicious PDF — malware analysis report

Static analysis result for SHA-256 da54efb1b508b17e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 07:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 931b54b5401a3b54a061ee8914a2bc10 SHA-1: c8a560fd506b0fea669c7a85b2166ca127da3e0e SHA-256: da54efb1b508b17eb02e72f8dfa343dbe6ed43e77d365a88dd5b3a0a26d778b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=best+live+cricket+streaming+apps+for+android PDF link annotation
    • https://miguktour.com/FileData/ckfinder/files/20210903_9FBF3769BD04D8FC.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423890a82fe---86507846029.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/57876968326.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/98699870034.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/lizatiletexakotixu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/5776371274.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/wibivitefujafipix.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/28280506641.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/sexududipev.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/39800258421.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/14692176856.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e19606d55c7b81d099f1cb2841b5e1d5/farakaxepa.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/04be77c228533467f9393c8b3cd6754d/bapaboponu.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/lemiwalulowu.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/duledes.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/kifutizupinederuzojadu.pdfIn PDF document text
    • http://suaups.net/userfiles/file/9978145202.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/69999635025.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/gazugugarovatoxow.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/53820916059.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/92254275722.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/pimonegoj.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/56185649356.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/vemuxiximafebokeforo.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/87073856857.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/guwamavowu.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_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 11176 bytes
SHA-256: 41cd1396cf1519a0790cdad9885bd713f854398cc328c199519968e0e2dfd716
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 17136 bytes
SHA-256: b8400982466b8a22e10598a31a3b7e4e76eeebcc3c2adfe969c62fa2552f71a7

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