Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1ef47ab87973fc…

MALICIOUS

PDF

91.7 KB Created: 2021-08-23 11:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5bc2af782f9c1bc0e52461e8674be9e SHA-1: e6fb4478d6db9f4070871a8616d7dfbc248810fe SHA-256: 6d1ef47ab87973fc7d89245a070e9637aa0650ffd29b8b9be1ecba3544a5e684
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=what+is+a+regular+polygon PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1migpvv1c6fu584f8o2lhv6tn7/bikonotoxamalav.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/vitavirofegepogisun.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/30844185600.pdfIn PDF document text
    • http://risme.vn/files/20323647317.pdfIn PDF document text
    • https://foulardfotografando.it/file/patidivorofugedat.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6quner0kh74aga2f84mcrf3c45/sudulikozupig.pdfIn PDF document text
    • https://actor-conseil.com/files/file/misofuzenezedovugasen.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/98444815271.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/36qf39nitu127v4nt3aubhomil/laxexotigotivov.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/guluribukabofenadogad.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f3c33ef9f---65514849684.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/77595045448.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/bufumijapuzixotevaxifade.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///zemofirovigipelemi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18dd110d1d05528be6ddc8571445a22f/9234950149.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/75287047253.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/77640859614.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8b3pdt6dq136abu2levml4hfnv/27312377756.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607622c7316f8---diramep.pdfIn PDF document text
    • https://wita.lt/images/files/22952199253.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e49076267c3---kijikikawapurenukosotem.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 10736 bytes
SHA-256: f8e855a9059eb7f6e9dda306ab54292346a9d4cfefb732cf514e021db1efbbea
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_03_sfnt_off0001329f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329F 17312 bytes
SHA-256: 2c79a9babc8e6507d18b33e3e0d38e5cdef1b049f6177b5e80c29f723cabe82a

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