Malicious PDF — malware analysis report

Static analysis result for SHA-256 39481926bca2c12c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 06:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ae8b61ca03dc9cdec1ea1315cd76937 SHA-1: 8aab23a80339e9da0f8da663b42dbe023d035d02 SHA-256: 39481926bca2c12c561f0cfeb6524ba6a4a392d8e626103788e234f5b213082f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management Systems or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://sreema.org/FCKeditor/file/41041993533.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15d84bd60---paxejulav.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/42070364238.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/99369371755.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/zaxeziwu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b446ce498aacad61c61bce7fd82bdb65/gisexegejigak.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/93061679810.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/nelikerijovunedexav.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68907516517.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/boxuseg.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/95589763273.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/wizerarovegafimukuroguw.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/96050428967.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/41176491976.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/81vipgodqp20h1ofb50pcl65q0/vekirevizot.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/vakufizifigojugagitilane.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/34890960401.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/pabijefadezaniv.pdfIn PDF document text
    • http://rc-modeller.se/images/file///selolavizewuzipetenokil.pdfIn PDF document text
    • http://newshop.jp/archive/file/xadaz.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/1292725730.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/koxamisok.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/bisap.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/21568282606.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/nejirazugovezotimepim.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/29074595377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=line+vocabulary+artPDF 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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10432 bytes
SHA-256: aff0628c3485134a7acc5adc5bd39f681fe491d484d4ec1db1c3fff3fc770661
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 17552 bytes
SHA-256: f7546b6955ca7a5630d508f6a31c015635a878dd0c315ca06cc48feac656180d
font_02_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1