Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f4f168246fdf3a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 05:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 693dbd17be09d08023e5429dd0e94d72 SHA-1: f1493090101f9872de7d673d9828534699db3ca7 SHA-256: 79f4f168246fdf3a1e68e82e66ac46e7fb1bd73eed5c71a7e49fb83ddbf8618b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Many of these links point to compromised WordPress sites, specifically within plugin upload directories, serving other PDF files. This indicates a link farm designed to distribute malicious content, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af63e7e9bb---dixisolavevovoxafak.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09a21c7b8---gofataposutagizozemi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4586b641be7337f77cc34045d27fca31/biniw.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/rarilesiver.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zifejusazu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086c55159a0e---zopejosutovuk.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f17ef6d952fea520ef77cc1af1f694a4/51665738412.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/padexumejikumomimarevofi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a2b7d3cf---tabegojoworakobasaranuke.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/66691183022.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/jebiwigadi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/vofunogugazi.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/26450133984.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/pekozegazomigo.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/xokujuludigowexawiba.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7b7dc6b90---57238338700.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/50663846009.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/41665184017.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/i4polcr4cqs8okjp4hibof96fi/49081647141.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p8eb9p3skjap2e5limfdnekkji/ruwavokofozoxoro.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5dcb78bf---gubatufip.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/302339253.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/23224725135.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zupamaxiguduvosipowero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=parts+of+the+house+worksheets+grade+1PDF 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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 10720 bytes
SHA-256: c28573a9588d2b300685b48a3b4dc93753aed4108f2090ca9987080fedd25627
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 17748 bytes
SHA-256: 1e37895d75ccb6f73cdebf7331a30d040145ee22ec919a8d9c820b9a2343c0d8

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