Malicious PDF — malware analysis report

Static analysis result for SHA-256 306f157961029131…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 19:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0f6cced78045b5b50fe63d44a0115fc SHA-1: f9afb475a979c974d3f3f18ac8a55c30628d9fa7 SHA-256: 306f1579610291317d6f9c9d4991cb3dabe2c9ce850be1a13ce2dc042d1c1956
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sushiloverca.com/uploads/files/gotusap.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67923d5b6---19012261553.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/sififafupudozedeb.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/womow.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/zusonebadajelotez.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/jesojefubowisegev.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/zapamobekimajafododusute.pdfIn PDF document text
    • http://zgic.ru/!upload/files/60831995820.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/32eed22e3c153395d294d8f80562ff1d/palejelekukimiduzovonuk.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d7d9a81650e37a365ca1286b056d49ae/25431895346.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/gawiripesomelipe.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gd9si67tqc487rhocuv6dd4n7n/nemalar.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/22904108470.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/kowatosesibe.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/24b41fef2e4ca2ab2f40291d7f4982c3/wuzenowaletixoxe.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/83480574515.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/vabunu.pdfIn PDF document text
    • http://3sdent.com/upload/files/garorajonafa.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/88293314903.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/56f14bfe78fda13930ee9a6197ad3a23/87711281345.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/41e65e04a75ffe4b4859b09baae8644a/12886658326.pdfIn PDF document text
    • http://soles2walk.cz/data/file/pazolojabefaralotagevefet.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/60034948249.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/napibakubiwi.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/rozori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=website+design+principles+pdfPDF 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_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 17184 bytes
SHA-256: f40781486625cb09601cd89b270fea0db64fbf91f3939e54866a06c28d78aa6d
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 10648 bytes
SHA-256: 4d3d0ffa464a175a8a0fc37b6c9c98d6bca73512a53ef321865b0a2f3e975d9e
font_02_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1