Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a04a7b27aa701e8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 17:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60133aaa6a914c9b86800932a6f7afe2 SHA-1: e4373135c51c80755b0616156960418f1480d31c SHA-256: 9a04a7b27aa701e8d3ba05879108e5f05da4db69568d0103ccd47e3a1f65eddb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing content, a common tactic for initial access via malicious documents. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a6eb3613a---84836168618.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80a266a0e---lovifazot.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/71853992627.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a848782c5ac---gazusutaned.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f806e50eb3b---korenojonuxapivonepu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd260f43c---panonivujusupak.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/nivobilenevolijitenataxa.pdfIn PDF document text
    • http://bulmarconsult.com/files/lisudukaxagovoxofiz.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/litupij.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/81823655301.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/rofubimevodevazoponi.pdfIn PDF document text
    • http://drironcat.com/images/file/jegajijesate.pdfIn PDF document text
    • http://rafaelokazakov.com/file/38748092631.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/86767313622.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611e9fa093aff---16977081739.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cc5e0b89a---97468923237.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/39437739642.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///23405742101.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/24267338447.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10d2b0ecb8ec8959185eaa8d78f8888e/jonanegogoji.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/62016682212.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/a52ce6a3387ec954e1b2b8e88152f74b/riboguxa.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/38676216126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fpdf+line+break+after+multicellPDF 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_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 19456 bytes
SHA-256: c6449b781b2d56125ed7fcd17c31b11ccd4b6b4f467aa4e7b4c45ab15b519676
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 10804 bytes
SHA-256: 4a97cdd4ad4b2502e24795b12de7db7ccfc8699d129f8e8979f91138bb5e5af7

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