Malicious PDF — malware analysis report

Static analysis result for SHA-256 d108c1ec84f1998c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-05 03:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e91381d38860a6991016f4b0c1444ab SHA-1: 19f51ec439039c7e7677150719d6d3e4584b1868 SHA-256: d108c1ec84f1998c2f5e1d99c985e4d467595bc3666fec1e30ab007589ea4716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=create+windows+10+recovery+partition+manually PDF link annotation
    • https://ctapigroup3.com/contents//files/24010847594.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37c2996b18---54808303980.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a741bab4af17a49d44e877c28d9854e/8593644224.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16111ab40b0dc6---59437737142.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/dizuzejigavimosafupuwumi.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/10052549255.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/danufujatiwatalesi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ee4a20bdtt981sflvfm5nfai1/popemepevuser.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/62933801471.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/40456958870.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f6c89cdf---97478192101.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/34914559322.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/59202003602.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061516104171.pdfIn PDF document text
    • http://koala-al.com/d/files/fokogisanujel.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160843a4544b66---59618966070.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/94634203863.pdfIn PDF document text
    • https://agatanorek.com/files/file/50850523720.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/21700943974.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/37108018662.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975d777d578---xapubewawibuj.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/98421678800.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021944882409.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/68994315456.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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 14820 bytes
SHA-256: d4850adb2b2c55d8aafa2353893f4bc306e8ad6aabc3ab37711fdfd61c139f94
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 11248 bytes
SHA-256: f650e6ced05e30021bb71cbd5a9549c2847b1dc6533bf7eedd0cc88fad18a227
font_02_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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