Malicious PDF — malware analysis report

Static analysis result for SHA-256 482e20e31151fcc1…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 00:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a28ad8003ab1bf03de925ddf79dff10 SHA-1: ce64b64910be0575add2c2cdd8dbc0f448be52da SHA-256: 482e20e31151fcc16884d3e9ab337e311de3ecff8d3fce168f6a43c7178d3fd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, many of which host PDF files, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7b7aecaf---35266648929.pdf In PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/59208364254.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/bovulaxali.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901132127.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/duluzopodowib.pdfIn PDF document text
    • https://actorconseil.com/files/file/69919707886.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pizudezinimaxajekepe.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/goduk.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfae679308---gukejevixufovigota.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/68355124376.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/002be80af35d1a37142d5521c24d0a1f/87080253772.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72145331247.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sabefedudix.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/27181387672.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/xupotajubalubugajabita.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/25276987439.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/gidipivudazokumajadi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6938d3fa637f7be979bbc75d383b8a8c/gagivepoxe.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/46608236198.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/36984795316.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kedufepepawutakuzopow.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/29404612953.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/40578761465.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/kogalalidideputajet.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/tumuxifapupizovita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mortal+kombat+2021+live+streamPDF 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_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 10752 bytes
SHA-256: dc1b26cb7d6aa7be5a4da08bc174bf2b72f8b3e709869ce5d4210e83b5399f17
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 18488 bytes
SHA-256: aa17d7ef1d1240215b9609d8f2fbbdeb4b7273f4be43e02cc834cd16b9ad8760