Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d30f4e366c4b25…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 23:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7d3af0e041df5beb3866db8881adb985 SHA-1: e9542c95b9852ed50a446a3de853eefc9c3f9414 SHA-256: 12d30f4e366c4b25538b635a072570a1a6a015030f24901036471516ab0e76fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and numerous external links. Several heuristics indicate a link farm hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=ghd+sports+new+apk PDF link annotation
    • https://tekartltd.com/upload/files/39529671514.pdfIn PDF document text
    • http://edituj.cz/res/file/75023620452.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/23590613354.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/98965123874.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/tevewagutovanafisos.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/29425907193.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/fedelodimo.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/91121168258.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/26131556068.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210913_FC4A7DD21F4F1129.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bda5e3ab2---vagilisoxulufi.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/juxapokefikutabigike.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/42345587382.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/xopejar.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0c85983f---1518562429.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/givedisoz.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/40362462817.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/fibojo.pdfIn PDF document text
    • http://cabini.it/userfiles/files/nuwubobesizetuz.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/32094159448.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/86298308651.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/73f708159dd604eddf50c4430a27551e/61710785196.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/30302032620.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_off0000adb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB2 10568 bytes
SHA-256: c5cde0c8bea980025b803ed00299b2261972d3aa0f5822cfc0800455c3f5736d
font_01_sfnt_off0000c5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 16108 bytes
SHA-256: d0bc6df5007af2e001df4adf5018b909e7b932fb71486225df5f0a9f200e8b29