Malicious PDF — malware analysis report

Static analysis result for SHA-256 578883a0b2053b8d…

MALICIOUS

PDF

84.5 KB Created: 2021-07-23 00:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 715daf15fe346b040bfa3d58c223bdb0 SHA-1: 2086f2e5e9a96343bf339d46f1cfc6b153944343 SHA-256: 578883a0b2053b8d92e91c1480fdf9c58b30ad6222a8bceaad98ab5980c98d75
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ade0a8d6fd---81271948707.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0d120828---zoxegijejukiri.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce3610d14---16517584319.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ba354bfc4df4c40e506f2a13135001f8/71216171555.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7108ca035---69484081534.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bgfaamhegqkusi3224dm22tk51/todatolisajatesupedaso.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210603_072949.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/baa7e779f51bb1f497689f29ad839ceb/paxafubobima.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/nijonadinibeberesoxanum.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/42198963903.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ejj806a7v2rgr69g15d0bb987s/60852043620.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/ginaguwaxizobox.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4ce918dc---fagukiduvaxi.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/14733108672.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbfb42f33b---panexegitawokijufem.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/nusefojob.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/aht002sfpip3sntt1atmhqddn7/16885219497.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/namoxavejagageko.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608663132b648---fipofimijunokegigan.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/jobavesezuxadazoxoveziz.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/koxatanizimeduxel.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/126a6aedcfeea8a0c0dd221c974aba7d/vupaduvunolujamopuxu.pdfIn PDF document text
    • http://cloverdiamond.com/file/jetinuso.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/bujipojagawefobemibaz.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f994c0f37---bagenogofupavufinewov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rolling+of+metals+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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 17092 bytes
SHA-256: 42818278eeb026c6a922fa7d166019f97dd83b4b76093d116eb60fc5fafc917c
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 10788 bytes
SHA-256: 9b1a1155feb370dbd63d9153f85b5cfe2fc65f626044b3c3b296a7b431277530