Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb04441f430c4dae…

MALICIOUS

PDF

110.0 KB Created: 2021-07-21 12:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a1389bc58a9767fd9145f0441999a945 SHA-1: 40d59a18ec4937504238e2a6ff6473a56955450c SHA-256: cb04441f430c4dae6d548f0767c15558c00b30cc4ed0130416d874a517546c6f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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://monkey-do.net/userfiles/file/gozusutomozozikujoxosu.pdf In PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6b43e5add1d12e551f6ce5bf72f2a604/jisirelezaloluno.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094854d3c995---kogapemabusivitaxobip.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/tosejufaxejar.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1f5b27b1c7b5863ede7b66fa0f1c3c27/ligipimurowavofolawud.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/13354261156.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/68834086673.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/d5l4iv7bta6ea6en9866aeko24/86011206264.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/45acb052bf343adf11446b183744b660/rezubajino.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e23b53fc2---kadevixugivatamilawabidaj.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf1c034a71---remexivemijev.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uipfhipj8tmf2sandnvu2qrv5s/zeponikaxojojutisebijeru.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/84918635615.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadc506f163---2808082813.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/61670866497.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/78147671125.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/94904100350.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5150e176224e91d1ea9aa7faa7d854e1/59734595676.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/rosobajepejedivudezoguk.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/11714195950.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2339bf2027d3ed353dd9151aa674cc39/36369413868.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d0ad1d9d3897e1e9f683d9b6b742a93e/fogasulo.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/gigibeforufivulexapa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f4iph3kfpf035q7qg7rbiilvqs/maravagowavam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wildlife+in+temperate+evergreen+forestPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 10900 bytes
SHA-256: 597b802ce2d3b661266063aa267f813fb6441f6b8711803255c657d8cb461c28
font_02_sfnt_off00015918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15918 17856 bytes
SHA-256: 25e74b8b364165b3fe0e151925460b8036ff4f916c70f8bfbfb7e65a53478bdb
font_03_sfnt_off00018764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18764 2636 bytes
SHA-256: c1dfba8198630d1c675c7fa68dd04d53931386bb4969928c14d91014d2be20cf
font_04_sfnt_off0001927c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1927C 16420 bytes
SHA-256: 37489218d52ce32dd28123d4c310a10cfc3bb07f141ea533a2d25f3ab3582304

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