Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47c43bdabe81ffa…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 15:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f277d42dad02b7cf2f0f80df5172cebc SHA-1: 97c652ac1afcac4de3a72c58d3ecb02a1e5b0104 SHA-256: a47c43bdabe81ffa7b3863778e208c62837320184b64143a96787818f5a6d75e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs and the PDF structure suggest an attempt to direct users to compromised or malicious websites, likely for phishing or further malware delivery. The presence of numerous links on disposable or compromised hosting reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=how+to+hard+reset+android+phone+using+pc+software PDF link annotation
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/28018126371.pdfIn PDF document text
    • http://pi-consulting.ch/download/wumidopowadurogufevu.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/26549478685.pdfIn PDF document text
    • http://artdental.hu/editor_up/wefetusaxokixetawa.pdfIn PDF document text
    • http://afro-safari.com/upload/files/sotaxikenovek.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/wogoregixoz.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/42e241bc55a010b8a427da364a2f8a77/gepalumamugupotoloturuguf.pdfIn PDF document text
    • https://vestol.bg/files/file/61492331294.pdfIn PDF document text
    • https://ptogel2.com/contents/files/xanuxali.pdfIn PDF document text
    • http://kite-surf.sk/files/50667620999.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/4701562970.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3b3c2082---sesofuderuketobi.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/jutunumapedaneputus.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/76597512387.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/74569557098.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/96211167561.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132954d2c716---50574163791.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/32767380040.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/wawivurojumetoxutofu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613266001e228---15341370536.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/soduladat.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/kasarewedorugaxef.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/bamiwinugulomegegaroj.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/tosudevimosisul.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e57bf77---7313705869.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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 11028 bytes
SHA-256: 8aa4e1e19ee640dafc52a6a09b7a2028e38832eb01972634e76ebf6620017c19
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 17816 bytes
SHA-256: 005367a6cd006561ce9904e180f322f0a90432ced8ae3891f05eae49bd88aca8
font_02_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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