Malicious PDF — malware analysis report

Static analysis result for SHA-256 17140aea2e2eeb69…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 04:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7845d081bb2c364ae9d5d7a188fafb3 SHA-1: a5f6cef65d7782e92183fc0f678eb881ff843ed8 SHA-256: 17140aea2e2eeb69a03db2642355e5eae1628672b3032d2c9ca7dbddf244af10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=mettre+a+jour+la+version+android PDF link annotation
    • http://tyros-club.de/userfiles/file/10069812749.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/15716680011.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/33645323658.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaf2e396e---konuxidadefusafunozon.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd95e3edb7---90467872368.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/gowufameze.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/81032616861.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905224913_zg2wiy.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/zixuladegitovudin.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210909054453_lkfrkn.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/38392026993.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/54158746174.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/77304746808.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/nolofiwitu.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/topovesimotitelad.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_232208.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/dulopotezufisuturato.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/30012663522.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/femefexedojopojalalemati.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jolurezaxub.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/b3u16r9l8loiom6i51e47vageq/37558130380.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/5138252480.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/kotakolebufuvulagix.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_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 10532 bytes
SHA-256: 58827539bbaaf003e3c9cd16ebe4b205abdbed0ebd49745996af01d851e39e70
font_01_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 18456 bytes
SHA-256: cd6e8685a6409c6db5b6b0cb3cbdafdff46e5d0f908e446331335aa17a8f153b

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