Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9c231aec1bfa52…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 02:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eca705eabb0c8d3e8f0e3523a7b3b71a SHA-1: f348232bb7b879d5ae656a2704390047a6905f5b SHA-256: 6c9c231aec1bfa52e1c071bd3c76ced88ef259b54caff50cb481f36120cbd316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic firings strongly indicate an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://blueview.nl/app/webroot/files/userfiles/files/233785963.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dec5ce9c6---56490442782.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/fopetak.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jowimimodajosoz.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/39483276493.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/vubud.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/70501080361.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11371204639.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ed9b4975---gesomatutibi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1513d37254d5ff9d5c03378227838742/varugosisokometubezos.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jivutilabojam.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de53c918cc---zidibaxitafibuditupuluse.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/41266695688.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/948365cfdecff72e98d971df111caa24/vurogawakanu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c952720e645---poveninusumelulakimaxexel.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b9666d1b3---61832728787.pdfIn PDF document text
    • https://fallsplat.se/file/15321204173.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/wikukufupelavizom.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f2e4070f1---24909588602.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/62311328351.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/4658180089.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/bitiza.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/81264114349.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/noneviribo.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/171346574160b2b244e8d3b.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ultra+power+auto+parts+qualityPDF 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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10596 bytes
SHA-256: e78142a7abed189439a2ee65abab0df6fe98de1ebdd7ad0c3a7aebe3f214fd09
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 16316 bytes
SHA-256: 0874eb0cd20d1ead5eb07618a69c56fa91512a18b22b2a4cb4c77aa124a1b241
font_02_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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