Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb4dd95b2c0134c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 11:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ab65297900e08129e5c3232b413a908 SHA-1: fc9c6a219fcb30700a9a5de9504c26673d916ed1 SHA-256: ddb4dd95b2c0134c65e0f6c4a1244e4796f3db58e7d274ed92dc8224d2ad8c2d
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 CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lghluiboebheri0utjllr0n8v5/noxibu.pdf In PDF document text
    • http://nemochem.cn/upload/files/49288538461.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9d72c557---guxikasixiz.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/zukuladupupimewobave.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/70542966023.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/6290537860.pdfIn PDF document text
    • http://reopen911.info/media/file/tibarutoparejoxuberoreloj.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/toreleniz.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/tuwevuxiwovujogile.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/64715664336.pdfIn PDF document text
    • http://kaies.net/upfiles/2109072317146850013egb02.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/fiboxokires.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/85917942293.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/lufejap.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/29545320255.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d89b8ebd7---detokegibe.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/932426829.pdfIn PDF document text
    • http://poliinc.com/upload/files/21125876640.pdfIn PDF document text
    • https://kawanmto.info/contents/files/luluwudifavogidineforuli.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/mezetumer.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/joduxizepedovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gridiron+gang+streaming+vfPDF 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_off0000d2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B9 10756 bytes
SHA-256: fc6e32a575883307aa5820bddbe5009f5740b2a526862d655e354db7382fe669
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 18540 bytes
SHA-256: 65fb6550b28906c8d7b47c4a85786196aa9378b0ad9b20ef8c76ae3026587f8a
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1