Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69ff2635c49e123…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 06:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 894888a49422446b3ea4b32a199a996a SHA-1: dbfad64e6a842fee72e40c82ab619ffea4977591 SHA-256: b69ff2635c49e123f4073048b8f7a95657535ccb163a81b55f8b25daacb01337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=redmi+7a+reset+settings PDF link annotation
    • http://bedrucken24.de/userfiles/file/refokidizuxob.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/titisidizemososudadoverix.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/mamugonazizekemol.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/42116125986.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/nedujezoted.pdfIn PDF document text
    • http://orem.mn/uploads/files/26546244971.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/92251051619.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/11900279128.pdfIn PDF document text
    • http://xn--bqrr0jw6bmw2g.com/userfiles/file/1632432219.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/93llhnt2d7rh099rflv2d6qelr/99160019175.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/13991800251.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/38948335745.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5rkonvdtn4nh53jj3r0088d1io/vavinudipoxelekujaxe.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/33530503639.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/lujasik.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/savulevil.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161525aa225d84---56051885905.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109202257115864.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3f379488---59629692795.pdfIn PDF document text
    • http://saydersan.com/firma/files/66414587126.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_off0000ac8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8B 14408 bytes
SHA-256: f5b27e28aa9a04235347172897661d31830be224271890723dbff6935ab2c745
font_01_sfnt_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 10520 bytes
SHA-256: 515ce09a927a413f9f6316e5890029bbbb527bf0cbe2827b053ea9aa24be0fd8