Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad551a4177db8ea…

MALICIOUS

PDF

90.2 KB Created: 2021-09-21 17:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9d663246b85875ebe362b63b2407622 SHA-1: 083c687395328ed43288749d1e202e2382e43ec8 SHA-256: bad551a4177db8eae0ea317a64d7eb1f9429c97598fdee9a4cc10167317f5eab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggest it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aiming to deceive users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://coretry.ru/uplcv?utm_term=minecraft+free+android+software PDF link annotation
    • https://ozsersogutma.com/upload/files/kikotuxifanali.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613771ad07494---zidedali.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/14892316784.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f75eb92c---fezuxesumapoladogebutimig.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/kopovolezogabavomejoso.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210921095527016986esd4va.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/fetijularojelizixubaz.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/40649428016.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kanido.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/fuvonit.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/sudavomi.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/10804226001.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/30200197071.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/topeliweliwa.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/13477534097.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/dusanizifujuwif.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/71f5dd6ef33f0f3e341f43cec51ecf60/wixabebarozokutez.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/tugagegaxulubukefoxakazu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407a4c6066e---posatid.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/jevepubawizarorinumorod.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/renizawu.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/mogonirafarepuvito.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/tumakejafapasiromilo.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://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_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16892 bytes
SHA-256: 5043690fe6feaa346ef957d87ad227ab2d8e34dc434e468ffbfd1b7c8dcf73dd
font_01_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 10500 bytes
SHA-256: 14ee41a7b13839b1fef8fa18549e4b26677f01a08fc62c5bc7ceb1144efd9634
font_02_sfnt_off0001459a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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