Malicious PDF — malware analysis report

Static analysis result for SHA-256 d696f6c30f27bc79…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 16:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb605f43d20926fec7a52d046bd098b3 SHA-1: 8cd185d7838d1d910fee03cf59278eeb5d5eca57 SHA-256: d696f6c30f27bc7935d5c37bdac584fc96e793c220b379d3ee88aee333e55d42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to link farms on potentially compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=the+hitchhiker%27s+guide+to+the+galaxy+book+1+pdf PDF link annotation
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/fenawenir.pdfIn PDF document text
    • http://mrybalko.ru/files/fevazamezogatosaxefajov.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/50908675405.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/52928274006.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/gogowapedem.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/66298111402.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/ladatapusozoz.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6de873265---zanumezodukinosokoxilutib.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/77224936586.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210901215744.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/tekodape.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131723c74f3f---5108556280.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/xiweveduwevawitopeva.pdfIn PDF document text
    • http://bdnchem.com/upload/files/rifilowepoludidizixi.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/5948402388.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/76242571139.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/zuzepilonilesasemeravula.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e014d8a383---misajuvemiku.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/65321605950.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/91165191327.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73eaba449---15425838922.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/74893978802.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tufilupitiserukuvezozu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/sa7po7molfopke167p0j708d10/maduzitobupunasogisiser.pdfIn PDF document text
    • http://harlit.com/upfiles/file/38890614810In 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_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 18560 bytes
SHA-256: 771a08519ed0e9acb6a80c6ef0eb4cb33d112ecff49d9035215da18bb2a323ae
font_01_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308B 11392 bytes
SHA-256: 726fc98805a3789d4f441843b5f236e5566bfbcf54a6059e9dedef041bfba4f2

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