Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d78e5c78809217…

MALICIOUS

PDF

87.1 KB Created: 2021-09-23 20:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1e10078f8e695c2ab6eedcdb2263e29 SHA-1: 2f54ac72e768e398bf1126b3fc5a6e7106ddc8a1 SHA-256: 86d78e5c7880921784adf1e461be5c9c0fc9e9a626636f26700293a5f0c7d166
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to potentially malicious content. No scripts were extracted, but the overall structure points to a lure or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://onlineticketreview.com/images/file/16228373302.pdf In PDF document text
    • https://slezanie.eu/userfiles/file/mujapazuzujofebadi.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-14/20210914081129382820.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/fokasojebenimopuxekob.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/busigipini.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/bavejan.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/47499116529.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/66be4c2d13e1dd76baa369b4fae125d2/71717780796.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/mirijitulowabim.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/widubasonoxavegisimi.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/kobagejavoj.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/32453321560.pdfIn PDF document text
    • http://ktcz.eu/files/files/71806148771.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/19162631646.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/17112335661.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/zikit.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/21138134062.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/jorexobaparemawutomiz.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81652b734---63585950863.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144f05e97870---16511105600.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/dofutibezonijimovinuw.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161306a58860a9---94376574782.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/fotinor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chemistry+class+11+chapter+organic+chemistry+notesPDF 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_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 18796 bytes
SHA-256: e075b0c9aa9d14132e1bfca31b2343734bbdee21fcaa6ba0804b3a0f5fc874c7
font_01_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 11016 bytes
SHA-256: a7e410aa7adbcbd574a4252596236ae3d82e4df87e40c6d85b4f756d7ea38ca2
font_02_sfnt_off0001362f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1