Malicious PDF — malware analysis report

Static analysis result for SHA-256 186c80d97ecb16ec…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 17:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce3c857ac3f92c43e13cee564bc91c5f SHA-1: c839fdd21d0f1f40409b354161fc816a415283f1 SHA-256: 186c80d97ecb16ec83b213b96f3d4972d547197c46d5179c5f95a925309aba14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=escape+room+2019+gomovies PDF link annotation
    • http://jgweld18.com/UploadFile/file/20210912202012148.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/91520964124.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/guzoru.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/nodobeneroma.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a8ee76452ff2298f10b06296deb2cdfa/nabakojosalujo.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/15965727560.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/vavubusafuleziduliwi.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/pibezupibimuj.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109231834362859.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/badimubipin.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/segefobam.pdfIn PDF document text
    • http://uhorder.com/upload/files/59888798375.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/15124255646.pdfIn PDF document text
    • http://skupka23.ru/upload/m/zajovekeleragamatule.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e21bbeef78---kagexofotoviwolanofezetur.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jonona.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/1086742185.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a5c14643626567353a6d909853443122/vozaxofe.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zopipejedokutexuxadi.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/23824800940.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/wosolipo.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/87736545902.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/dabazigidawevirakak.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210911_93791E633B5F4E18.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9e2d32e2d1a434b5a552db8dbe6bf400/tigafivubibupijix.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_off0000b1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 10980 bytes
SHA-256: 71ec904578050e3aa5b8c28b33178c57954477587c1cede6f7df4d1992fc722e
font_02_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 16868 bytes
SHA-256: ade0bdc7b96de8aa364dfd12a743e15c30f2b25d9f9067dcb0f0c6ee041dd52d

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