Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb41d4dc33429837…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 06:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f95c66b3a2fa323db1010b2cacbece94 SHA-1: a16a5fbc9d8ba3efa68e35aeb996f1e5cafdb3fe SHA-256: eb41d4dc334298374205d3b8f333dfaba4f3d63c0076b7361ec307d5f15a613a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://kcharp.com/ckfinder/userfiles/files/damefasesubifovuzisikuz.pdf In PDF document text
    • http://profstil.az/userfiles/file/75032827216.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/73509328183.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/40972494240.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5bba6dda---91428605918.pdfIn PDF document text
    • http://halmar.info/userfiles/file/raruz.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/65859011364.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/21514495441.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/24994032065.pdfIn PDF document text
    • http://kustari.net/userfiles/file/26242728596.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea355a8cc---lapunomelusebozozoten.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/kuzilatedixidilefa.pdfIn PDF document text
    • https://koratspring.com/upload/file/nufesuluxim.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/jejukufu.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/robetuxogusolazepadod.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/82392492332.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/mojabi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43fb9654---46266994790.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/novetaxadonulewip.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cec23c5dd---futujudabo.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fulapeniwovil.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/58627201200.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/57323948856.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/12912216357.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16141c935b121a---vibarati.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/nutegajudutefabiranelupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=i+feel+the+need+the+need+for+speedPDF 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_off0000b233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB233 10292 bytes
SHA-256: 5ddb0132300c77eb6e4ed33e76d30f667e43a08fb26e3b4c073268cc62a325d5
font_01_sfnt_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 14528 bytes
SHA-256: fcff2baf1bf981ceea2f56220d949d6ea845dcc6605101ecf53b196f63899de7