Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba67b50b28f7dea2…

MALICIOUS

PDF

84.6 KB Created: 2021-07-31 13:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 847f0816240144f7c27f110c12f5fb7a SHA-1: d8e0ec10cf060ab1eafe183516564b3072ca5814 SHA-256: ba67b50b28f7dea246f8d0f06400cff6390c516b47886bc01587662bdcdd0a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sportgalaktik.sk/userfiles/file/70643551689.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5acfe225ee19efe5d0618f2f3d7de5f2/seratag.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/25309938322.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/98d0895dc81f7819f8cc6a1e228f7394/42160735736.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/76723016830.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/lipixu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609299c533581---37700103783.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/91976394669.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d999b02422---zewiparegitawepezokoxuj.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/97610524722.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6fc27140---70242606011.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/74246d6c41bf84b8d2316d7fe856a27d/16118617340.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5c0d166cb---xewenaninozukus.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d80febc2b244f248cfc3a13fcf7e9ca0/43188692697.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/72837020558.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210620172857.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d94dc01dab83db7ffcdd283988aac68/49173104174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=acrostic+poems+examples+simplePDF 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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 10512 bytes
SHA-256: d8c9c537e74d7f66f4a8318497faa836eb6718bc889973ef36b316dccc0a60b4
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 17236 bytes
SHA-256: 438b720c796a3df4f2504c0f063093f5f5184ea478d9c453d309816e2166254f
font_02_sfnt_off00012caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1