Malicious PDF — malware analysis report

Static analysis result for SHA-256 1169131406870458…

MALICIOUS

PDF

87.9 KB Created: 2021-08-12 21:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 808a8426f80e64a1fb70c33bc66c3aa8 SHA-1: e61e67121ad984a2a523fd91c662e9cf4d70a8cb SHA-256: 11691314068704585ea3ce6d22a596ba4d829e219e05ed43f3b902140e86fa2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an intent to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alnadaoil.com/userfiles/file/11516009025.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5ul4n5560ocjvhkab0obt6buc4/91445460131.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b991582e88c1d3b48224d25c5ab24fa3/damorop.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/25741906489.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/24270996492.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af8574f59---2376585286.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8240e6cba207b6c33bc847021da0204e/46778233403.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/gafivuruporirejeda.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/68995305370.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160788ab66f339---xuzefexi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e40141eccff---bazuk.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a34815a3---87778390687.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/46bce249de1ff1d5c6e8ad4e306b4fde/ganupajijikak.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/rivex.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lugarorafemojiwarodup.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/riwulitamux.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/vanobuwaruposivuwil.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b2ebe3cab---75994736310.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/74930870748.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081701c548a0---pinidididapomifavudakog.pdfIn PDF document text
    • http://unsersohn.ch/images/file/86182915412.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2bf6arnjuqeeidojdr08jao08a/visejig.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f497cecd---97959767918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tamil+christian+female+baby+names+pdfPDF 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_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10980 bytes
SHA-256: c4891d68cabca38b52a0a016f6fbfd6e2d151494af2c7a536d43fa847f3b1135
font_01_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 17248 bytes
SHA-256: 13456e2c41adeb9e4e952c91e71baecd14c0230ec418af365128653146cfb862
font_02_sfnt_off0001393f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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