Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3af2844d3b0d45…

MALICIOUS

PDF

94.6 KB Created: 2021-09-04 05:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 447dd9f1ad63d8ffc30add14229efba0 SHA-1: 47bcda0dd58c88d6b277914d0b13d47f3ca1a5c9 SHA-256: cf3af2844d3b0d45b8883cdf4022cf764d6e5700de16b7a4a1c49e1407534dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://sibaco.ru/ckfinder/userfiles/files/gabena.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e2b5a581e184a48804c8670b94e9332e/vubanimafivo.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/93714494095.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/51767589055.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/boi32po1oqgeg5jifh8oikb6c3/lavikawuj.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/81266102087.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd119aa45b---linozoxojolarinolaxedix.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/34542261443.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ae8b37a27---89448206881.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/hbkc96gkbue10fekv5bdluu9ie/vegologogazafekizina.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pimizenumumolumu.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/24692609708.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865c8b60385---kijoliki.pdfIn PDF document text
    • http://allycatering.com/userfiles/zazamekiwijavoba.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/90450390673.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2dc95ac86934498a8823713ce252af38/nupikabekegamasasa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2850e51ff7---23963703100.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/63183931043.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c06e23115efc366b06950295b747fc0/27478166347.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/29631183414.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a10a11bfb---vudononozuw.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/jitiv.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/xezawidola.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/32221794152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=c%C3%A1c+b%E1%BB%99+ph%C3%A1i+ph%E1%BA%ADt+gi%C3%A1o+ti%E1%BB%83u+th%E1%BB%ABa+pdfPDF 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_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 29552 bytes
SHA-256: fc54cef21364407550ac826a7fd92778d4815571fc4a559e629dc7f22bbb2c78
font_01_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 11656 bytes
SHA-256: 1f0cf684812235f5a54d0c8abccb1efc858be9da049a4b8e8bbe55cade54b1be
font_02_sfnt_off000152b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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