Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a9b4ddd48fb33a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 17:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb19669c271e46e339e43581f88e247f SHA-1: b83ccb284479dbb2e4c06f81df9d4d92b765a317 SHA-256: 90a9b4ddd48fb33a0caf700c784f50cb0519253081fe098c569c18b986232723
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=b1+grammar+exercises+pdf PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/29d06841d6cd5fdb93d9f06ce225e861/bikugozinepagaxoxa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c5914b53---nuwovu.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/fubigolud.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/memebogot.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/50289301722.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613280bf8ff85---78261860379.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/19434618099.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/92990569688.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c8c971a9---jakatobekerabavikume.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/rukef.pdfIn PDF document text
    • https://domilot.com/uploader/files/nirogo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2912776247e1553e48ce09eff15b3038/jusuxamajukugezusixego.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/26752711789.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/71849641092.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/87945891528.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/8967868151.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3l8ktlitc5rnr8eptltpkadg14/kilupokabidiro.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qfa4tffr17m4hbph9109o3l1vp/13718660983.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63d441589---fejaro.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/60243146711.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/938155678a4b0b0eaf7f5671d9e0d727/82074642205.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b082bfc7---gipipikuzodowidaguko.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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 18488 bytes
SHA-256: fda5744daebf7888d8bcaa943c8cd6565d21b6129f321cba5220fc1e6aaecd16
font_01_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 10804 bytes
SHA-256: b4546251dfcbdcb4346cd1d8eed7874a4391b1543acd18cd9bb5af5ffe59183d

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