Malicious PDF — malware analysis report

Static analysis result for SHA-256 9547a7f70cc571fc…

MALICIOUS

PDF

71.1 KB Created: 2021-10-06 12:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 06403072cb17fa7ac9abf682c3664034 SHA-1: e11e63371045a974fbdc64ead99bf6db6d61ee74 SHA-256: 9547a7f70cc571fc6bfb9a289d42c2273d08bf6622a7a8e478532ba6e65db0ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ketchas.ru/uplcv?utm_term=s%26p+500+chart+today PDF link annotation
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/221818542841.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/piguranelapumegiludes.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/dumivobutepamogolato.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/pixelizo.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/90235384522.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/bavesif.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/66084477587.pdfIn PDF document text
    • http://secondary.oksalesstore.com/uploads/assets/files/46199518896.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/lefedunurerila.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/u1pvbvgtsvl31uc9p09kmdtig1/mujobibiboxatifi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba47aab7e6---36992911705.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/giwositonomuduxovewabilu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b620be752---mipeza.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/8015597116.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zivun.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/163101562199003661.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/76694481814.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/funejikesapadipapoje.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/5447713840.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/zozininulupob.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/17458365743.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/82949841223.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/99475053996.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/ledodapiwimanaxop.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/kiredumiwizoro.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_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 9148 bytes
SHA-256: 068d7593d680cf987ffe66044c416b5b513915a5de28901e3c13f1d1b86c4a20
font_01_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 19068 bytes
SHA-256: a6e37287796f41cadcb445112cbdb04304551a6fbae36e937e6f7cdb83d16b59