Malicious PDF — malware analysis report

Static analysis result for SHA-256 de826cb5da00de03…

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 10:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16e65079ffd5133973795a004d7007a5 SHA-1: 05f08076f85afead7d0b143a8af59bbe9b762671 SHA-256: de826cb5da00de030c69986fadbbb5f980e51439ffdf883026fb423325333087
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The primary intent appears to be to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/risazuzolenukawig.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8f492c70a---kafimasokateworos.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/nufavidowutolejuberamemi.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/21266885055.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d80a44d93b---pemetenofopakisununig.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/lakozilide.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b89324da02158c5e664e975d1fb01bbc/loxedibabeb.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/87ef49265d252d6703e9ea80d60d3a23/muzajibisajotujanik.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xinisuv.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/99807197662.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160aabdfdaa405---82247579045.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/47353940392.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/tojinexipipulorip.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/53348817769.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/ruxizojoxobetivosivi.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xumenizi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65a69b25d---fenepuz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c0f2a44c---buvusi.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/12556091064.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1603d56b96---46277496493.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a85515a23a8---461683201.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/6702419731.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/kamirijab.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/duxafatawolok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=small+lump+on+testiclePDF 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_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 10608 bytes
SHA-256: 96e01ef2f90fde014b6b27123fbc9ee06652b5885feee6534c4067d8662553d5
font_01_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 17760 bytes
SHA-256: 7b140795bfd288788694cd8c3cd55231218203914a9e512645a1937f0fcebb82
font_02_sfnt_off00014176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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