Malicious PDF — malware analysis report

Static analysis result for SHA-256 b282f46427ed3195…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 06:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4d75306604dea518acc4632a9c6dd27 SHA-1: 2788228b132087b84b01987bbe4a1de7ad2d7e82 SHA-256: b282f46427ed3195373277fdcb464d8a1f96c880d8839ef87e6ba73a3bb3e8f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://i-chat.tw/js/ckfinder/userfiles/files/vibowobuvefejuvetudadedeg.pdf In PDF document text
    • http://retroldn.com/userfiles/file/kitowozof.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/dokorunugizug.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/mevozitimavemefon.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/guvamukasas.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/45170362497.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088619263c3e---nitukamugomi.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/6094351192.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/tobibiles.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1ed72b0b502886dc1940d147f9f7747e/bosobisudelabotawasidixe.pdfIn PDF document text
    • http://wjcopy.com/upload/files/8900353652.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hpq8gq0jp5n01e8cefver1b3u0/38428375151.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c07b65f7d---zufoxifopenutanazipal.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/fozadalasefiniruwevari.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/depolix.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/64900154038.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/61499496189.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/worewabadugojowafoniru.pdfIn PDF document text
    • https://lasanisports.com/files/kalizorosesokurizapik.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/lonolamu.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/19270662236.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/79100005345.pdfIn PDF document text
    • https://webhosting4.net/media/file/juxuvijelom.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/kodunuros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=simple+fractions+worksheets+grade+2PDF 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_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 17048 bytes
SHA-256: c5e66b67c4eb5637a4da6c409d9865b54b7e92944b925817806c72a9b2408ef2
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 11440 bytes
SHA-256: 8080f9a2d1ab69a2a287fac1ce26a73d5c0e7babaea85bbf30fd6f500235149d

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