Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bcc2790d9b5d79…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 21:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40c0c8a347cc2070632220528ffaded7 SHA-1: ea02cc61afc55faa4720ea49036747e04e4391c6 SHA-256: c2bcc2790d9b5d798c2fc70a10857a691b812717a2c13e735f312cc77431c0f5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing structural elements indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/736abab76c8e90298d5764182949993e/85365749018.pdf In PDF document text
    • http://argyleliquidations.com/userfiles/files/dobotuvupasusejaxa.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/2661112261.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fanuriwuponovewupujo.pdfIn PDF document text
    • https://iwistw.com/upload/files/766984176.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7acdf347ce9164faa9253d9a3bc9d03f/xinetuzobe.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/mosuvowabebedu.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/nurebotilefiluvadogesiz.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/jamopinam.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/456df8c762438d092bff0ebd9e18b450/rolulazimusuwovob.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab288b07e9---68050113688.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc01e34481---76016901333.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/drd39nb7vnae89bf0o7ctnokmb/dakuzuxozoneroxu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e877e3480a---3601222414.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/fizesudulefopamewi.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/bitasikejikax.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/36252231862.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/lepusilateji.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/l59chq4mc76ptu9kr1hmsvit2h/22662886253.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16113ac61b8694---84279096518.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872d3d09335---89018365246.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/3093388103.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9ed00fc55---79067808650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=le+comportement+d%27achat+du+consommateur+marketing+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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 18468 bytes
SHA-256: e282aac7e36ea88b80c045a8948ce637aac2aeba6f4322dd8b7ec3095a4f41c3
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 11204 bytes
SHA-256: dabbb417a2c1f82aea001d84604b952f8e4db1b9bfd47e57abe7a21e8eab6b0c

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