Malicious PDF — malware analysis report

Static analysis result for SHA-256 6769bdd322b1c9e7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 00:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 207454486d931368bb706aeea6db85bc SHA-1: d2335d6aa793a606063f5bbd92f2aa29fcb8f545 SHA-256: 6769bdd322b1c9e77345aeb0b44df96068304d6668291aebf6f9efb0ad3b13c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, likely directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=pokemon+gold+beta+download PDF link annotation
    • http://bonfiremadigan.com/uploads/fckeditor/file/borejubefefuj.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/31634443895.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/fufetukesetiz.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/75752023584.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/58074366843.pdfIn PDF document text
    • http://imbirimbir.ru/files/zomulop.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/duwefidedifafofube.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/kejipivedamawi.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/samunel.pdfIn PDF document text
    • http://ingore.cn/upload/files/zobevoperali.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132533fa2509---lirinizeg.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0303b87b851f6af938e3173be14ed08a/puduxu.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/jalaxugitinisir.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/605231405.pdfIn PDF document text
    • http://www.andreapondika.cz/file/77919666656.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e633b11d60---35912976951.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141e3616085c---gitegejurepatagetaxaj.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb6a148ea---57987632987.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc779ccf5---bopupoto.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/89674147530.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63802665041.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/nubujotivatizikadega.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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 10548 bytes
SHA-256: c2dae6fe0d6350058ecb82dde220872607ff17bffe73897fb4cf5dc3f20679de
font_02_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 18840 bytes
SHA-256: ebf844d88118f269cc1f601d2fb6f169fe379109e02dbf086219b2b38c3f8b08