Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f84b3c4ee3d48c7…

MALICIOUS

PDF

91.7 KB Created: 2021-07-23 10:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a3cf3e93a5ce341fb902d7c60becaa6 SHA-1: fafe7eb582c7c9c214fc534801f2a9fffdcd1bae SHA-256: 0f84b3c4ee3d48c785111389d4556f8f7422119e172e60bece0b2c435b1e198c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb20f0fafb---geguvevomuwixo.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/693e48a83gu8ca5p7v4mdoq4a0/zanilazavofax.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9257746480---21988810031.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/23780300718.pdfIn PDF document text
    • http://congtyvima.com/images/Download/57922656158.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2e6cacc10ade6762d3141c925865875d/bupod.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zawosikanawukupodewemasi.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/87928868322.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160802f981ade4---monemenipesolanafake.pdfIn PDF document text
    • http://sy-smile.com/upload/files/70941605241.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/pawupofaximidi.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/loxonuw.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b8e0f19071a1da398ebc49ea8d2d01bd/leziwan.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/foxunabozajefi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609472b8a3b3a---rokujekuxu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/fdcab832a5f363163fd1311e4032d6b8/kuxaxidud.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/35707736280.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/1a11d4b7bedf3b0689daca1337d33b34/16817738709.pdfIn PDF document text
    • http://aven.su/userfiles/file/28667274000.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/lorixosi.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070401050887.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dufena.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/sadolotum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lic+irda+exam+question+and+answerPDF 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_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 17420 bytes
SHA-256: 8fea8aba5607ed2543c63ab77b7b37d32138745aca96b0fc264a1a3b02e0ed43
font_01_sfnt_off00012fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD0 10876 bytes
SHA-256: 397f7b26c887f3d7a5811e033ad9b5bc7442f4657c3e5b7b5809973f1e4a7b61
font_02_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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