Malicious PDF — malware analysis report

Static analysis result for SHA-256 f847bfd6c4cd9567…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 19:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 715766fcf6a88dd7d3bcd483ee877465 SHA-1: 57f98ca1e544ad1a594a0b01ae62c3c4a2dbbbfc SHA-256: f847bfd6c4cd95678df91f600003ae7f6dc530e65eadf4791c534b02d557664f
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/torajunasebu.pdf
    • http://sushikyototogo.com/uploads/files/57227182547.pdf
    • http://snieznik.pl/userfiles/file/26758251933.pdf
    • https://taumed.kz/upload/2021/09files/21090807380580096993hng.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/dabedibuseba.pdf
    • https://hagakure.by/upload/editor/files/10060693769.pdf
    • https://siemreaptraveltours.com/userfiles/file/daseguponaxodarizisev.pdf
    • http://ajk-opakowania.eu/upload/fck/file/90178953008.pdf
    • https://ostrichpharmaceuticals.com/userfiles/file/1422936536.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mokopoduka.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/wesubopedumirapifovubuj.pdf
    • https://edinburghpools.com/contents/files/wilogojowetadonanajagi.pdf
    • http://haihengpharm.com/upload/files/11006008622.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/40049981831.pdf
    • https://cuisinescartier.ca/upload/editor/file/63420280655.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/aaesh2mqtsukhu8qgm51eknsmn/80751984061.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f170110211---lesemasiwusologadokiteka.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/tajoluluxaxenaverotimapuz.pdf
    • http://lignumweb.com/site/webroot/uploads/files/64168847416.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a1a72ddc3e06b486ce481d212ba461a0/kezaw.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/68293413709.pdf
    • https://12waktu.com/contents/files/digakerabu.pdf
    • http://shinyoungvalve.com/userData/board/file/fepoborajetopedokodozit.pdf
    • https://sainaudit.mn/File/bemakejex.pdf
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/nemuxededated.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=yard+sale+apps+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f639.bin
dc20d061107f2badc9c7505e2e4e6a01670ce6ffb9db0f4e4878a38831280367
pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 17432 bytes
font_01_sfnt_off0001233b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
font_02_sfnt_off00013b52.bin
54c422e0ff23ef4d2f19758a9603aca86653164d9e6a204da25304ee78ce0f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 10268 bytes