Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35e5b38ca169b77…

MALICIOUS

PDF

81.9 KB Created: 2021-08-17 00:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1399659afb0d1109f6490acfb06adc0a SHA-1: 96e5e39de026516b82894f7d2dba0700c9fc573f SHA-256: d35e5b38ca169b771b86bc20569958ce3adb6f5a2fe43db472dbac1e59db1f73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as a distribution point for further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=family+tree+template+including+siblings+and+cousins PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0p2bl541l4jbp5p9eieccdospo/7198544669.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abda60c3748---46997780899.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/midafematiredaxusuzavi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4be711b8e---38069036659.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5iiodkf3rlrniui6ricbodfsl7/zugam.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c368bd738e6---52898499219.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/kujuvejomuruwopip.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/12dgpkkit35jnf88ejb93c8qh5/vegoz.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/26256672251.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/95192832164.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/kalikuwol.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091af3f53361---jesagimusebopanaw.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf258f937---foparabogukimimunudadewu.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/5201420105.pdfIn PDF document text
    • https://kede.org/userfiles/file/vakogika.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/76317792811.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/69010334908.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/xakike.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/22327965641.pdfIn PDF document text
    • https://aokman-drive.com/d/files/vonomokemigiwefu.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/mirudobaliniweg.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e968c1c1---naxunuvubabelodera.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/kosiruguxixapinasufam.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a083b4153af---93724517509.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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16668 bytes
SHA-256: c0d25358d99eefdb328037a856b85e20d5f6d91bae6cee71c9e847e5e98ae2f5
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 11188 bytes
SHA-256: 13123bbf75b8312c1e6383312436f339b9404ee58cca6304ced8ad7d49dd405b
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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