Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a787e1f91d64803…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 13:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 109cdff96f3dcde45e10bd10f4c08a85 SHA-1: ce87025193c8ddadcf29138140020a0faf5fa95c SHA-256: 0a787e1f91d648036c5ac2c26ff04cce41a9408edcc696e7aaa23144ac01692d
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4sfbpfipqtanv14v1j20rcoab/87503793230.pdf In PDF document text
    • https://mecaniquekd.ca/upload/file/45572486757.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/90391022926.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/maxixoluboxi.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/5931109209.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/fabojoxezifevuza.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f77900fb081d2f6e0dce7880ff930bbd/90636592843.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/fozopevifewul.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/55282814340.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/loruliribirepavozuse.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/29943041592.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/75264818502.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/37465974025.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/xafezubawur.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109272317308155.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/wuwedalitinojumesi.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/97312053122.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/41241044935.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/koxupowojipanojagezowavo.pdfIn PDF document text
    • http://vpsystem.com/files/fck/35931092325.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecd89945bc---379786330.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/46445659273.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88686108683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apk+button+mapperPDF 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_off0000b196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB196 15044 bytes
SHA-256: ec728793ff2b436d28a3c85f387748261a7a4e37d430f5532aa6ea52f4f972a9
font_01_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10420 bytes
SHA-256: 08a384686a8f8f6b78ec55db3c4bbed821558c62293a69a097e1a717ee370b5f