Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d52626a6e55dfd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 12:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98777e422b7b22cdbf43e248e85532df SHA-1: 2999f18176bd7f3c910ea9660b06cb20c90377d7 SHA-256: e5d52626a6e55dfd38c6718d228050f522b7492ae9a05624c718b7295c2eef32
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. The presence of external URIs and link farms points towards an attempt to redirect users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smgbid.com/ckfinder_userfiles/files/samixazikojijuvaluv.pdf In PDF document text
    • https://ckmusicdesign.nl/userfiles/file/99033967402.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/rewex.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/9789106243.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/97834090104.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210902_A8AFC8282497A326.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/62544288727.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/xefixujumimigaj.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/28ho1vbnvbmpd84ojo0lvbuo7n/buvigefojiv.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/38597238547.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/nenarorawugividos.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/90816795959.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v10ccatfmc3763j4vf1am49s40/safamu.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631377735.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vopiguren.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b5e8758e4a6785776c2c90cfe3e367b8/75973093043.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/80ac1abc62747a5df429eef89b40b33d/3096858310.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/pixaxerof.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/66118148473.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/88281690108.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/tupewodefuwirilo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bb86a439a8a1fdd0b4b3b3b34d951430/tafise.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/medite.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613104d9e5e36---92028139917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+know+someone+visit+your+instagramPDF 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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 18664 bytes
SHA-256: 0ab4f3de91a1fad117b07830b034a5dc0a09a481478104f5bb2b690cababb095
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 10856 bytes
SHA-256: b3f62a4713fbcec6e5c95f015fdca392dc0ca73fad8d9deaba46b96a2716e377
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1