Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3277fde7b6539f0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 20:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: eaf1697c2d29b2b278e5ed375f021d39 SHA-1: 4f8920830e6259aa68043125942509fe86e2696a SHA-256: e3277fde7b6539f067eb55297a305d4b475a52b665f10bc9f62336a2a4a57c24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those hosted on compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=how+to+remove+system+update+on+android PDF link annotation
    • http://samuiluxurytravel.com/Uploads/file/domosikubanabawiwanalu.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/jisedegube.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/11506294733.pdfIn PDF document text
    • https://tekmaker.com/upload/files/2986376264.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/58964861921.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/24830124587.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/legesaxowidiru.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dlpnsgmrm90lb3a8orbskq862h/joluxoje.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bc2d755a9472d2efc30bcac2559d71d7/sapefuku.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/wofige.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/bupezu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137943a3d11e---vuvapitiwiwovapiwuv.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/84894587441.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/gukobigoloru.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/60429440578.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/53486839391.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210910011619.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/6507583842.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/perinawimijelejofex.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/zagikoripidofisuxebinife.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/lonewaxuwutijepirop.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/54234871944.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614152afd81c8---zovetopamaxiladidu.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/pazasiwodusagozimejoxejo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/nuzugoga.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/witibidamupofexivaniju.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://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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10864 bytes
SHA-256: 655efe44828718e4b995fe2ecafa5522fe4558ff2478f4bee24b62b41cdc5cbb
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 18016 bytes
SHA-256: a8088f862c45d7ef3b3ec4354970c1bc50651d742e9b6cc84af78fe06f7e66fd
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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