Malicious PDF — malware analysis report

Static analysis result for SHA-256 42914de7ac2a04c5…

MALICIOUS

PDF

78.5 KB Created: 2021-07-29 22:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e327e31060946122b8897abd3037269 SHA-1: f94de2f493a75ef0eb448490c61d199591417a55 SHA-256: 42914de7ac2a04c59db574a7489ee0bae275319cae1bb07dfc308d9f3063c06d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to host or redirect to malware. The 'SE_INVOICE_LURE' heuristic further suggests a phishing pretext, aiming to trick users into interacting with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jagatjyotischool.org/jagatjyotischool/userfiles/file/32981787699.pdf In PDF document text
    • https://clumba-indoor.ru/files/files/lisokududas.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13acacdff9---mezominuneboruruko.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/nujisatatiw.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/zatikoxobamaxoluwo.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/99110237884.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/20336364432.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/69747999907.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1160bbb755---91839268948.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/03810a3250b04a9bc4bf2c2273a408b0/degawigawitamudabu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e477b48e14---foguxitozizavibelasu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d079b530---53161805662.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1c4add768d32af2a8e270fec49665a0/nubokuja.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/76870033105.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/zukusunovaw.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a90aea6262df64117ee8cb0a1d4873de/subozodopubulowaxegusava.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3d4ce83964d75940a8959756ccc6c181/75948478696.pdfIn PDF document text
    • https://signika.pl/Upload/file/vidiwigiridawosekev.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/lukup.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/32914640784.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091a8757682e---85143203114.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210605122929_360272423.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/2882313073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=debtors+balance+confirmation+certificate+formatPDF 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_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 10640 bytes
SHA-256: 25ad58a4c11568261ac5b28a87bd483e394c69c39c4cb4c4021ea238a4b2adfb
font_01_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 18328 bytes
SHA-256: 01af3bdf6578ca303ec5a50baa2d1feb1bdf6aee61e75d7a060c77fae9f2efd1
font_02_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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