Malicious PDF — malware analysis report

Static analysis result for SHA-256 979ac626d9b6ab50…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 14:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdcb7da039ad9f274db09bf460744daa SHA-1: 58f1d56b23553001124f05fcf8e7dbbe00ead08d SHA-256: 979ac626d9b6ab50491b43d65dc7e8022fa505a60f493e1bd832dea7799dbd7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term=descargar+actualizacion+para+android' in one URL indicates a potential lure for users seeking software updates. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=descargar+actualizacion+para+android PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/9617850842.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_011118.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/16867414638.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/sogijewijigigufoneve.pdfIn PDF document text
    • http://jinyezi.cn/upload/91167428660.pdfIn PDF document text
    • http://xtra360.net/campannas/file/74519270791.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/93399866895.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dbe1cf05c29e35e9aa86bae011028c31/38669680532.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457e4a4e967---woximo.pdfIn PDF document text
    • https://camelcarpet.org/d/files/juwixomudezizen.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/30655368860.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/nojedanovodusovekut.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jilolomala.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/79344444473.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/84809198290.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/10416507426.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161348a7e300a0---91195149302.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xugodamupisigogam.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/54008865333.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/46b19ece2b449782ffc0bb3b5e4a30fc/vimivigaj.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/wiripuwotigowunojeliwug.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/milat.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/fabinerited.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/domumefutotiga.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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 18852 bytes
SHA-256: deda6971556e90fd9f3db9b3b3c0cb7a7ecc4c9b045350179086649b6fc6f143
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 10852 bytes
SHA-256: 836fabaab07d533597da871ac073758a62e8973451d0893d3d5bad7fd683f777
font_02_sfnt_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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