Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff209b360f6e1be2…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 10:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 93a9e19854cc57bb2ed0929d1d9a1adc SHA-1: 7f3d81500e149804e19374d44c5e27cf508314f9 SHA-256: ff209b360f6e1be2828eed2140341073f81d3a4f593112492ea0d277f2dd0243
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters in URLs further supports the link farm and potential tracking/phishing campaign.

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 https://pixomot.ru/uplcv?utm_term=allcast+receiver+apk PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rkdm6vj5dbqvercvd4teke30dn/58777084673.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/pigujuruvapanuzapikanimam.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/18538819120.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631032192.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/66049257418.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/80094176261.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/75157147360.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/75927707192.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/77383010288.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210902002259.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c09d5cbbbf---89599999309.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161365182311f7---24670069071.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210906132003.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/buxesikunumumorodunit.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/69186673303.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/fudanibusobivo.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/korusijowibivoduxot.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/37190098006.pdfIn PDF document text
    • http://chenruichem.com/upload/files/tipazemu.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/50085925299.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/87378068984.pdfIn PDF document text
    • https://udruga-invalida.hr/files/83511832179.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/powedugutikuzapuxezifej.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/27300554506.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/teniwa.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_off0000c5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BF 17852 bytes
SHA-256: c628e2be8db475a149a1e7b7a3d02ed1da1b111c8b696a04654ac807f132bc68
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 10284 bytes
SHA-256: 40f547cfa07dd9aed178cc0f7a7ef74e173a1d2631ad5694e5ccedfb166c707d