Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d49663d58794c1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-24 03:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81e7e4d531ad8198786f70365e14d002 SHA-1: c7a4702a742c4761a6e19752b409bf83c9f58b89 SHA-256: f1d49663d58794c1502d773a5b292da3974a868b7dd8eba70510c515ab9d2593
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads, suggesting it is designed to lead the user to download a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or execution of a second-stage exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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.
  • 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://philabc.ru/uplcv?utm_term=donnie+mcclurkin+my+help PDF link annotation
    • https://korzo-galeria.hu/files/file/2374685397.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/305507019d4e782cbc4a55b5bbef5ca2/benusesevepozixadugixel.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/legijovijugenisewe.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/nesomumagesoxexigateluj.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908213828.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/42970320518.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/polatawixukuzefewajono.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/tulosatetuvomewejexasi.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/fodebujevoxusupudufabew.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/fitatefixopipapemefabiji.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73011343965.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/39544167283.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/51101904911.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/87073055858.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/lisagurubogofawisumusid.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/rotegelevusegorudotix.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/ribalomaribikorira.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/3467065700.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/mafidilubivebutolozebar.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f69c4db5---41169168335.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/50366265763.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/vumivimupidetek.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bokogevafumomen.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/82117427559.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613243c6c0809---25429220553.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/346235803.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_off0000c0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 10520 bytes
SHA-256: cc847cf888736c25c7dcc9222af7f973e77df5f2be756f98e2a48fd142b726a7
font_02_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16424 bytes
SHA-256: 046efdc69616136ce98b1117f488cad14fe92ae9f151c99bf84169102c09d3dc

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