Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee64df51a75da0f1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 09:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 355542b75aeda1bbe83c45bb8797a408 SHA-1: 36001d4b377323e23e74f5af60a32aaf0a9af69d SHA-256: ee64df51a75da0f12a6190fc2b4d0fbded32e0d8a5ff3d47e70701562f3af367
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a cloud-document share lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=free+online+convert+excel+to+pdf PDF link annotation
    • http://irs-messtechnik.at/upload/25796484761.pdfIn PDF document text
    • https://12waktu.com/contents//files/fobusumapuzajifomediwolip.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/bemurafaliwi.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/55181996674.pdfIn PDF document text
    • http://uci.ir/userfiles/file/54786452479.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bce66c2ef---xukogobe.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/30454117712.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72ddc7ed3---99031263066.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/gefugarimeganezu.pdfIn PDF document text
    • https://artbynela.com/uploads/file/62282299566.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/gawelimuwenolix.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/sigavosesi.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/35402132205.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/dum6m4caepq6dj4dbp8qmvgl53/fuporonerepolewa.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/tominegisuribirofixe.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609846ff37092---fewufazepexusupi.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/46366654081.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/rarakowerulagotonaxok.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/binupilaludozaxurujuf.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/gevunusomogewuru.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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 17248 bytes
SHA-256: 240e1a9117a2845ff5ff73a485e693740cac0ce96e06d57c2f4b369a7e9ca86b
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 10428 bytes
SHA-256: d74288684ed734d4fbde27e2183c3a87bbaa98d79df5ad69b21d627e9c5f2eba
font_02_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1