Malicious PDF — malware analysis report

Static analysis result for SHA-256 816b546c1ce01574…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 07:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0780423a679413e13e6ee97cce99e3b5 SHA-1: bc503fe867eea39abba8fb2ff1b07e11d1325f1c SHA-256: 816b546c1ce0157458be41715843da14998b0f13e6233fdc683b3b966c0dd43c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to unknown or potentially compromised domains, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://heureka-cz.eu/files/xibuxizorirofemalaj.pdf In PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/wevovabavojizunefi.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/wivijebajukegifogobag.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/wufikufakipapotutisuwom.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/daau5n2kn9n6kgfjh5vrlojq9o/31669200230.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/diibq6qorjikugs37blchjelcu/lobagefuripekudive.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109110645131693.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/45705366426.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/kovag.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/23746396799.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/gewuguxetifirutelisuva.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/vusivejikiba.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/90923385083.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490ed1280ee---13060280424.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad8286639---32708811971.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d51c83b81---xukadomabe.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/kinotudik.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/56344140439.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161389226b3422---93284468919.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210911_095727.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/pezisakubogorasu.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/sawivinokowup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=boron+atomic+radiusPDF 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_off0000c197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 10508 bytes
SHA-256: a44837626ca132c4ea90b2341799a93f2821d15b363422e4a0952acd616650eb
font_02_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 16668 bytes
SHA-256: fe4a8766def0448bf051871bd979bb7ede98a2e6fdc289403cd7b7bfc4dd9f1f

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