Malicious PDF — malware analysis report

Static analysis result for SHA-256 792641a58cecdc09…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 02:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77b2a023b1725391b7f2db80cf659706 SHA-1: 9698a7813f0993ed6e38ab7373ed1213164f2a19 SHA-256: 792641a58cecdc09f66e909ad95ab657bb79c29f1427b99d6d05b1ebc5eca857
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and is identified as a link farm, with multiple URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/n051llpu1fqs01tt1f8ojk9n24/didekufexiluwoxubinedad.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a4a72ee3e016b086184d1340628c5afd/31592484564.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f888919731---39254465959.pdf
    • http://maihome.hu/admin1/file/sakifif.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3d95f956---6981287089.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/8539555267.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sjmg801vtv9p8n8m1pcch8fcsv/ximisuvedajajafixozibol.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/patubexaliboxikedagekamez.pdf
    • http://nhs1980alumni.com/clients/878257/File/jobanekavalekoposudod.pdf
    • http://shiinamotors.com/js/upload/files/visuxuwepeluzabizotudera.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88c9466d5c---kajekoxasifazaso.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c337b0f87---46059269646.pdf
    • https://linker.tw/files/72728453870.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccecb5a196---50218823309.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c78fc3dc384---37475871728.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbdaaf3ccb---galamapilagi.pdf
    • https://maturana.cl/upload/file/88207621777.pdf
    • https://andana.us/files/files/66034430552.pdf
    • https://discoverthesky.it/file/63205718207.pdf
    • http://wagnerpc.com/userfiles/files/3367151075.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f980e38046---jinuxadavusogases.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607176951c3a9---bixiruwebefepakosigife.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aec4059526---38787899528.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99b9a33d2---5629507107.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=feeling+exhausted+and+light+headed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfc.bin
fa6d35f25be84ff46747bf0261e9ec8109c655e406079755e3da0e138e0d6643
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 16740 bytes
font_01_sfnt_off00011786.bin
adb25d97c8363df12a7753c821b2f01c6bc2492cb4e9856b6d6e11a15cb7ff01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10484 bytes
font_02_sfnt_off00012f13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 16792 bytes