Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e6ea798e40529a…

MALICIOUS

PDF

75.3 KB Created: 2021-08-17 14:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c53778993e4549eb43ce4e38be68911a SHA-1: 1a863da0a90adccd16094b7defd65890b451b731 SHA-256: 88e6ea798e40529ad2bbbf441ec0dc9e5c178d275b06c1a47a6eaf9a760d451b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search engine results or direct users to malicious content. The embedded JavaScript and numerous URLs suggest an attempt to download further payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=tu+tu+hai+wahi+mp3+song+download+male+version PDF link annotation
    • https://www.nvsrolko.org/ckfinder/userfiles/files/18911571617.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/bozonedapebabigekufe.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/714f8a6288e4425fccdaddb8ba667c34/porepokilibivixojefoki.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/78792311754.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/59012847709.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/96255695911.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/cd82c9b259780c92cd17729fdc668437/17628079163.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10d353e5---20576180299.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/72455115558.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/41a2b208540a1352a55ef199861d7509/lejuwosavuzufusopezomu.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/wixizevaz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4d05872f06c45b728cf3d13c8772abd6/79555106753.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcbc2bfdc9---58903092959.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/5513445035.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/62477889940.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/77249209550.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a21ceed53---64708660812.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210702_110119.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160789f78a0d06---rurobizipewuwase.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tiwomidugagagifigizezu.pdfIn PDF document text
    • http://utopbrake.com/uploadfile/files/xugowabuzotonogozol.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/3hm1lgk0cjg6ccjruvbeq7d302/ritulitazotezesojoji.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/lafewasemunixawaposituxe.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/18600431876.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6bd3e71cd5d0bfec13779eb64fdd03be/79906993880.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/89774389782.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/zalobidapemabegirot.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/13027930798.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_off0000c295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 11224 bytes
SHA-256: d196c74a7fbe62bf2efbb3a152c14b47fd81f56685a73fd091afeffa3ff56c7e
font_02_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16144 bytes
SHA-256: be86a48351a12e1fb1a875693e76dc31230c8d71725d72e8ed9d43189ba94d8c