Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef81c18a255ab195…

MALICIOUS

PDF

62.3 KB Created: 2021-09-15 18:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b54b74adb24d1285473e83100c680dd SHA-1: 85ff6d28cb2bb2ad70137e30f1880dc4a5f9f066 SHA-256: ef81c18a255ab1956ae47ab02e5f09afd1c9a74b6dc57883080da7263e49eace
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

Heuristics 5

  • 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
  • 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://daejonggyoyc.com/userfiles/file/20210904065516.pdf In PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/569660470.pdfIn PDF document text
    • http://citranco.com/users/files/kuburixofi.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/mebanibugatowoludu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/zidekelab.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc3cc2859a---mezowaxapapumisamuxirad.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/11873895855.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/zoxogibavufe.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/259090bb2378dfb5d977328c8b4da6e7/86002118935.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/nagadogolulojirilero.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/vajiwavos.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/serawezarutufatobag.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/pipiwasopaxaxirevuwogeso.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/nafajomegutojurozupu.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/18625422084.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/gixesow.pdfIn PDF document text
    • http://www.agot.pl/upload/file/xelofuwujijonakepa.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/genidam.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f9ibv88hf38kja1124ltf79rre/kaliroxuxezowojikekog.pdfIn PDF document text
    • http://rideco.hu/upload/file/xivitutixirenivenajutu.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/parikinofuvosifojebasun.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/94348193942.pdfIn PDF document text
    • https://digireg.li/upload/widufezuvapu.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/58764155746.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/verig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mario+brothers+romPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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