Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0cfe47f5a1f254…

MALICIOUS

PDF

101.9 KB Created: 2021-06-29 15:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7b010b5cc899c49de3f7843ac3ed138 SHA-1: 736e1f9555f617e2a7fb3988f5d30bf80b648c28 SHA-256: 5c0cfe47f5a1f25435538f410f0ecc122e531ec0fc73ee193e98ad8195a7b486
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ulrike-mayer.de/userfiles/files/55197809236.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/41c26eb83bf30934d4ab6fd98c64ab01/vatupu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876a3aae540---bagoxefebororegu.pdf
    • http://etasystem.net/userfiles/files/rawobekulalekafajajeru.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607297b5060ec---40459232291.pdf
    • http://barudan.hk/UploadFile/file/20210620142155918.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bt0nitrqas36omaikkj3878i3m/kipofovogalira.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8hvg2cfsn8ia4gnbmevuhd53b5/nagadowo.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/676094e82a5a8907714befcb0658f43a/70595062503.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4b0166dc---kaniralomagusekibuf.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ee82bd48f---31541490717.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b1acaaaf---29732725771.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eo5u0ftu1502rluj4tl6q4ud45/doremosunezokipatidinezav.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0e86d0d9fade7fe11724807f38216a0d/708209523.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/88330f2b45f79866bd0bd5e21d9ee139/munipe.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1005799f32---49849816443.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bae3d5438---73675173034.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/zigefowofano.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078702d89b83---mosagi.pdf
    • https://sardavetri.it/userfiles/file/tezunuvewomanobutavesaja.pdf
    • https://tort-art.ru/userfiles/file/55407373660.pdf
    • http://duancanhotot.com/upload/files/pumitodiluwovafab.pdf
    • http://agiusfuneraldirectors.com/files/file/123959935.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/0ab11759a162cf08cdc81d5c622dae7f/48845401625.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9a25003b---mogezidarodukozup.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c42d8371d9c39d45cce52dbb77764503/lutavigirugakupa.pdf
    • https://aslimitada.com/userfiles/file/8305983985.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=low+carb+diet+in+spanish
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d05.bin
9901293db2f60b6478c3c5aeb2ed6bccd1e9f3c822dde90e2af955df9c845525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 17424 bytes
font_01_sfnt_off000159dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159DD 16792 bytes
font_02_sfnt_off000171f4.bin
e1fcb79065e66191130ca90546783f3a044c85a4044f13eb78d802264dc1df4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171F4 10748 bytes

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