Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa079d483a1b811c…

MALICIOUS

PDF

78.1 KB Created: 2021-06-30 03:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7179491fe6a7b06d5695c542dee285a0 SHA-1: 2b077aca8f27da19d88c6b0afcd68af41eade785 SHA-256: fa079d483a1b811cadce5ed6286d453b0f176dd3163f5f940def365165094512
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to URLs hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/dbgnptgmp4hgh3ree4440g0e7n/45920933913.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb9690c8d6---67620418552.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b936d8e6---rowilu.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/69484125867.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f1a7d33a4067bf55f4bdd6c7f412400f/35192808273.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k73qdghdv5o8mbb8ntj1si5o15/wikuxodalugabewewulovowex.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/lifenagewinabesadupak.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/mudiwebowoten.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c7447122171030d01a9e1ede308d90f7/88233643062.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/sexerazi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d8ddeeb170a4511ec1b2b6b20a32aac3/28635186969.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/lakuguf.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e372c0854---fuxujujaxosolezarijegu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/de26c9e63ebc0246770adf8a0233c03a/lofodafijigefisa.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f700685fa79b9fb73d8d754103504bb0/keromororisunurak.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608014186c264---38930216494.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096f1f9f24d4---29854716543.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/43731695409.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbe7453ea---46605777196.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/titinosefotoku.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160870cb0dad9c---95441031990.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ab17a926980437c5833113df1397986f/52594009187.pdfIn PDF document text
    • https://bczenekar.hu/files/file/nobozipafomaxasiwekazik.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092973ee1d60---70498470179.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/76015d8135af31d3f3d20bb4a2449326/86800456803.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/tidamibibusefowidadisol.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea9070f213---jowokur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cystoscopy+with+rpgPDF 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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 10440 bytes
SHA-256: 9e7af87fa815c438e7380d0714a8ac95807f0156d1b70904ecd434a9987615c2
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 16128 bytes
SHA-256: 9f05c857d8c96efc22687c1fdd3c4b0a27128fd067177ece996c9fb5b30bc619

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