Malicious PDF — malware analysis report

Static analysis result for SHA-256 249371ee33a7811b…

MALICIOUS

PDF

93.7 KB Created: 2021-09-20 01:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b655a90c448a9cb4385e7394f40218c4 SHA-1: 27b5b3e1a19ff0f53eb7de26b7d2591207001d34 SHA-256: 249371ee33a7811b6936a5fe413e460ce010952c0e5261412fab1d4a639fedf9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=pubg+mobile+lite+unlimited+uc PDF link annotation
    • http://massarentearchitettura.com/userfiles/files/17294923264.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/burubiwidunufusija.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/31603145907.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/zojir.pdfIn PDF document text
    • https://mimpidia.com/contents/files/sevixelakolifarupeb.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/55155324343.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dd480509cf38afad1e4837b9519377b7/pokawukakilosoripibodese.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/622f07838693ffed65bd598ea420e517/71999564204.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/voriwemepafa.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/8378230559.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/60773692220.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/71878857689.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/11178873913.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161423c190b1b8---93820913287.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tunelilibimimozuvubipi.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/46424372330.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/64245728716.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/27006219142.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/peginuripanaforitu.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/29987211079.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/bulenixodepegowaxaxomed.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/80831108201.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/ropamuj.pdfIn PDF document text
    • https://istanajp.net/contents/files/xewuvom.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/uqcb02jl0e8bmlbp06b7b9t940/nesuzezejuvopubojesikeko.pdfIn PDF document text
    • 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_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10524 bytes
SHA-256: 9f91b6a0142abce72352b728257ffb7cfbff58d032c646040de560f9452e6502
font_01_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 22240 bytes
SHA-256: 63ab51c49e543ef2b7cb9dc258f8f9074e1ce42358c5aaddbc87e7f4059d7794
font_02_sfnt_off0001508b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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