Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e983e07c416274b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 01:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df1c88c8eb6035104171e8865c248083 SHA-1: 8a8523aa16cfc5a482c3e1e923b5ad5e272919ae SHA-256: 8e983e07c416274b288d06f03d9dbf9e3335999daf836e5a90d0ed8eebb4706b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://hemeringen.de/ckeditor_ablage/userfiles/files/97439165307.pdf In PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/abf5dff57225ed137c88b81c06a19335/61433756771.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/15271583850.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7cee1595748fcac9979938a93b1d3d74/nujikudojakefovalenida.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/bital.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/9220704390.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/5315105264.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210914114315.pdfIn PDF document text
    • http://elma1.ru/!upload/files/walijuvepalukakedosu.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/vumizaguzuzizorevedixisew.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/tufazarinil.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/88741311538.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/50fajt28l62oqh969hd3b29a80/89974854220.pdfIn PDF document text
    • https://invest.pl/userfiles/file/benedepuli.pdfIn PDF document text
    • http://christopherdallo.com/file/ravudataturu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/58850068225.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/kujuwiwoxafokudamubu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/37ba9800d44041a05a162f3e6cf76d45/poxexixovokagodumazulizu.pdfIn PDF document text
    • http://generaldistco.com/images/file/tejabiderawupamexiva.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210907162324.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/94668067809.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/vawukuwufanevemupajukizi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/072585742.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/panodaxemido.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/safexodijesovuvabubemunut.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/doxaliduwukisefoworaler.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161447295b1fb2---45056961015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+app+installer+not+workingPDF 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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10724 bytes
SHA-256: e24f3c656e811e345a7c30ca3c1bfbaa1fa3df636e23f7161030ef53701ad3d6
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 17140 bytes
SHA-256: b46b35f54f1964bd1d2b7d65e2348aa59079c493206b390eeb8b80c88d514ff4
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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