Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27da9733f226dd3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 23:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bd39a4f2802060092da850fa2dd21e0 SHA-1: e55eeacd46224ef04c7275ddb868276a209efb96 SHA-256: a27da9733f226dd30858c59472b2fa1c50885d5bb400a9c013dffbe5d93f6df9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=cinema+apk+free+download PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61a0942e3---19803365954.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/tugomosejulovusipebesan.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/depenaxi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sg5ftvbjo06jdl5q9u1a8vv3t7/jidigupiwitarunez.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/nodesepajebumasonofivaz.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/95662995566.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/vokobaxalewipe.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/58773780177.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/65883797735.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/21419501964.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/taxepaxa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175e1d4f25---22727472957.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/81156320453.pdfIn PDF document text
    • http://irinabailey.com/upload/files/fuwefovokojitusepamuv.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/98992223829.pdfIn PDF document text
    • http://sbcnepal.com/images/file/17768152649.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vosesimikel.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/63489352794.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/13b681910e6243e64f867378adefba45/nikunararaf.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xumaxamafodosezesov.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/23345190935.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/xipuvanokejo.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/73106913486.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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 10604 bytes
SHA-256: 5cda33f58018192d6c7c5186af37e49f1b3d63a2f7639b81500f46b41a6c18b6
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 18548 bytes
SHA-256: 738f3ced74f113229c8ea2a0bf939695dd9b3f8312a08f69bd4fff81274502f6
font_02_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1