Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eb91f43e2c0194…

MALICIOUS

PDF

86.1 KB Created: 2021-07-04 23:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c35ed3fd10995c7cb7668b8128190672 SHA-1: e440bf5a3ba60d28f6ee153fd22909f386a81456 SHA-256: 86eb91f43e2c01946720fce2d0e32bb7c0d127ef5a87c76c364b5e30ef052daf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It functions as a link farm, containing numerous URLs that point to websites, many of which appear to be hosted on compromised WordPress installations. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=gk+quiz+questions+with+answers+for+class+1
    • http://drironcat.com/images/file/nudejenifuwinubigif.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tvlo36ipaaqk01sciecbvpnss7/59554804686.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/20218cbbde09b7da50a00557ba0ad149/67548351251.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bad5757ad1---60331558109.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5ad1a00f---10768106482.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/18mqds254t0et4vtsndllkat82/12193841802.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cd03ef4c909f676bed8f40fae9b107a8/sugazewotimujijeb.pdf
    • http://automozg.by/upload/editor/files/mososafisodedefim.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e7890cf0cfb29a499181412027814753/50360035366.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7a999abd42dff9d8ef9c7739ec7c884d/dosajogoxobigoxisidod.pdf
    • http://inse.us/uploads/images//files/matugude.pdf
    • http://kursadowicz.pl/Upload/file/49093621536.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/nijazuranamoj.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3d99bcac---65920461991.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e5cc7901---85978480621.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebdad563d8---96117605887.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2914115cf907c0f479b5fea70c49696f/rulenokeliji.pdf
    • http://navigator-nsk.ru/userfiles/file/potududupesidenabinen.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad2804104---zexivaba.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gvmbrq9dfjebdvefckermk9hl6/42480204555.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51bd4a45f---62755035712.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e102bf382b1---63215262527.pdf
    • http://kibbkw.com/uploads/file/64942194421.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea69.bin
e1d0c8997d3b999db924e9f0dd4fcca72fcfd7845ee91c23708a4124438c259d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 11008 bytes
font_01_sfnt_off00010426.bin
d88631abf5af0d9f7028766258b04a272e091d7fe6816513e0b3ed368fa6529b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 17264 bytes
font_02_sfnt_off0001316b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.