Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d4f39469d9cf5b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 06:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 218104f35b090e14e3879f114ca8c0ab SHA-1: 1b9a689ff32e0dfb023fa55d743837e864c13457 SHA-256: a5d4f39469d9cf5bd7f987f5198b832047b4ba6a25cf29155cdec35f2664b06a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of PDF_JS indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jamones-luna.shopcloud.es/ckfinder/userfiles/files/pajowodedotijinek.pdf In PDF document text
    • https://begili.com/uploads/image/files/28498296831.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/jejikaromojipimolexonijo.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/gusiki.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/mevizir.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///11226714386.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffa093ad6---nomafevubaledudemi.pdfIn PDF document text
    • http://inphilong.com/upload/files/89776362632.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zurebefevusedikenitekov.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lebobulujudalaj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g9egoduc18fd8hgnit42ribmg7/50028727018.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kibaruxumebutufiwipe.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/nuvugapubajewogidureseju.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///ganut.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/46887844568.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/72973483600.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/fuzodarifo.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogomuwivitulegu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/42338125502.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/362138754191b2507230b6c625a5c103/2994037029.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/zesenes.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/lepate.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613df12a78af4---vugawizexog.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/67494049374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=imap+mail+kurulumu+androidPDF 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_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 10300 bytes
SHA-256: eaf4b0d1ac9a668f48ad312321aa7ff72031852f9b1830df9ae5e1dece686600
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 18996 bytes
SHA-256: c19fedfb4c309864d52b3d2316f61a2b2e901ef811c3e0df7289107b79dfc5ee

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