Malicious PDF — malware analysis report

Static analysis result for SHA-256 c852e4e226da0db8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 23:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c7946b957ceeaaf4fdfd09691800c1a SHA-1: 33d784ab16295870abd9dcf53b77805d3539457e SHA-256: c852e4e226da0db84675db1e7d26489341b45776b9c7fa3ca9edbeee394656fb
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 websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=introduction+to+computer+security+1st+edition+pdf PDF link annotation
    • http://gwardiajuvenia.pl/zdjecia/fck/file/23754063710.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5e8647edd---birimuzorilasukamujoso.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/kesenakivaxutivivopadar.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/kerakojadiwa.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/59d3362cb2d6063b494d3e70b2e47c37/65912950163.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/77803187866.pdfIn PDF document text
    • https://hgb.se/filer/file/sobuzaxarefodalenomimi.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/gafutevizu.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/gepat.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/q4n4j0d0o517mgss251i1neetc/gipavox.pdfIn PDF document text
    • http://getem.plfiles/file/duzup.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/palusepilaninu.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/kewekam.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/gesesomazavuxeg.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161152ed98bfdc---dotuvukuvinofizijuvazulo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/sgpai24g116suvtq02utg66ffq/lirof.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bitowadizef.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/40645593334.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/jokef.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0t8ucf2rjdh3j54heijkav8v23/zuvodorezikomiwoluzupatu.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/sarexabavorafuduwigi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0c853d80---89324089625.pdfIn PDF document text
    • http://tipiland.net/upload/file/37546468230.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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 17836 bytes
SHA-256: 523e5d68eb6b7f2a1fafd8db060238fae98992b728a6e942769fad2661a660d3
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 10792 bytes
SHA-256: 2589a095702d57ec7f27383e86afd5bdf347791476b60e826745f0e7597dbce0

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