Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf4576759549d8e…

MALICIOUS

PDF

97.3 KB Created: 2021-09-07 12:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e3679f76269c42da4d5294ee399aff2 SHA-1: 2631177a58910dae2d185b0f6939a623cb80576c SHA-256: 9bf4576759549d8ebca05da91d2504792ed67c010c4caa7905e48b935290dbee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its use in distributing malicious content or phishing lures.

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 http://chamdure.com/DATA/files/jilojapurewonubuxi.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/314af1955eed4ddde63d18e34536c3c0/lumitewexi.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/mezafufi.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/pemakogige.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010803485f2---61220659723.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/wisiwomupopadaga.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/ebd672b4eb0fef685f3d1201c119732d/zunidaxa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8eb092c1---99501287404.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e95ace24ffb0cf491aa73048cdee3f0d/zuwekegofi.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/nenazabagegomop.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/rovegajebi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3688d8b332---1984889011.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/73343760648.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/dawejoxo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/depawixojonazagi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/24e7f509de8201cb073ad07256cdf624/86877971631.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/2839894516.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/kuxomebidowil.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b68c3704e---jikerupowaxowe.pdfIn PDF document text
    • https://educhina.mn/editor/files/406639490.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jeloxadijopukazewisup.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/vamukovosifupiwax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fanboys+conjunctions+worksheet+ks2PDF 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_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 11040 bytes
SHA-256: bd850da504e28d9649cc1b5d15ac8b0ab80247228ddc0ecb9213076621e459c4
font_02_sfnt_off0001469e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469E 18464 bytes
SHA-256: 1a1e778fdb12c35cd47ddaded99ad64d68038fa424f4d7e36b796421308145ad

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