Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a5994c6d6aa022…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 23:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41dd4fd4506780058b821fd81b66d2fc SHA-1: 10970ac7c9080e1aba8ec816604d69c472e3b89a SHA-256: 47a5994c6d6aa0226f9ef3e32f9c94262d10f643aa10ed6f57fc6c6b26c4b278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://masan315.net/board/imagefile/file/fugudafeditawunesi.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/46371815371.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/83062664592.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/najawatopuroz.pdfIn PDF document text
    • https://businesslife.com/content/files/92184377718.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/duludakasobumos.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/64875656397.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/88505224739.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/puduxudikenedazorofivepo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ea55c80d7570d2047cdbba06c429f64/19841062716.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/poxewuji.pdfIn PDF document text
    • http://novichiha.ru/pic/file/momewavadekurojedeb.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/59651797064.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/kudazifixatuzub.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/devevivezakopapukuzipav.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb883edc6---37843851989.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/tosafupobokedeno.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/migex.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/suravita.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/simizepanepobasadin.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffcc6f3836---4433349404.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/34028662867.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/22175334911.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ff6fb8eca0b2d0ffe8aa999befcd5fe8/18481895843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=medico+quirurgico+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_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 10456 bytes
SHA-256: b94f310cac63fdcf60fdbd0ca1728644712946a1a58798a64329f31ac10a8466
font_02_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 18420 bytes
SHA-256: 0a51838e7b106d4d63efaa20d1dad3c69952c659f1402a3fed5a70ed9c89cf6e

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