Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ac4908de9e87e2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 16:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47aef21074e9581abe138b178c9ed570 SHA-1: 06e5bffa27221260340db7128b296b2bb7b968fd SHA-256: f9ac4908de9e87e298ab1cc2b3b68c7078346b7f67812e225fe0a2ae11abf1da
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript that likely redirects the user to external URLs, as indicated by the 'PDF_JAVASCRIPT' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. Several of these URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://soft-pro.hr/upload/datoteke/13302322021.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2596npuidnsu80rklimvpc3ik6/7602391192.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/48967063496.pdfIn PDF document text
    • http://www.siposferenc.hu/html/98948766026.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210528104959.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/fc904423f30c412d2b0b20b2191117db/definuzago.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/84504356249.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/lodinasotobikemimazun.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/39e33d5de29b90d251da139bb997e173/momub.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160744c0ac4314---96473693073.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/72083f68831258925f86f4471569ff65/tavedosil.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fd21cc07e---faxipirupujuwevujokulinip.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/77257877101.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/44722881668.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc819b16e7---97994405284.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/68394164514.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/wiwegofox.pdfIn PDF document text
    • https://ms01bet.com/contents//files/49905297216.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/pifobota.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/92612803979.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9372c318b---48248918548.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/vokotadidene.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/98954262322.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3fc703de4c64e56b90a42ea80411d72d/kujupovaxizaleno.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/7e36n75s7buhdt4g4svrsqgvvg/53883355358.pdfIn PDF document text
    • http://ktcz.eu/files/files/72786481700.pdfIn PDF document text
    • http://dogable.de/userfiles/file/14728682558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=basic+electronics+interview+questions+and+answers+for+freshers+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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 17452 bytes
SHA-256: 1dce04d9aa8b6f60e42344dca6b8ecac878cc38d4d73ea77f29d735592cca2cd
font_01_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 11168 bytes
SHA-256: 956b9da7349b0137b4b3fe10ff896b2c5d0573a2d0122d5f1016d2e1b66e6d34

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