Malicious PDF — malware analysis report

Static analysis result for SHA-256 9239e82a4993b825…

MALICIOUS

PDF

149.0 KB Created: 2021-07-02 02:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5dee04a6c05fe0ccc430edd2935d48e SHA-1: 8d1c8357e7bd665b00182f2a4689f587ed282e61 SHA-256: 9239e82a4993b825b82a3b01ede9cf82e755316fdaa6f2a22547ba4f89f64c84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous distinct hosts and URLs pointing to PDF files, suggesting a phishing or malware distribution scheme. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://files.ibiza-ferien.de/file/wamodunijux.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jdt6sg2b8p2r1g3s108ppht6dm/rubivefozegeku.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b14f7d9765547774330797543645618/85087637296.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6ns06fg5kq5lcavhoodpvbbhtk/84550352533.pdfIn PDF document text
    • https://cmoretv.com/userfiles/16751915890.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/060327446812.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/93141413999.pdfIn PDF document text
    • http://chikatere.com/Upload/files/59821037677.pdfIn PDF document text
    • https://chpcentre.com/files/file/kilidatabadukesebutew.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf043d69a---warexeraviwejekol.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f5f6ce2a---dijujo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tg6f9nvktjdqgs21i6b9rcrp79/99727083209.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/30952677545.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/93489862252.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/konagobenesezu.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/41695324965.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/82517010518.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/qmfk03fddt5ve7suctnfe0sb3s/ripenakozewunemexet.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446885ca9b---boduvepefuk.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/66509054353.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wunenesamezunaleliletiweg.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb8c067d1---53010145719.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51d765da---vuzoxegepixasebisakujewuk.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8ec895d7---fogudiw.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/novuwukated.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pray+with+expectation+scripturePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D821 21192 bytes
SHA-256: 4e48c423074a9297237c35a1ac299ddc1b96875c149b8ab112d0069482358886
font_02_sfnt_off00020bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BD2 19352 bytes
SHA-256: a697a3162a412c1232b04af7b14dec2cffb610de405cc3806362e8545390873a
font_03_sfnt_off00022cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CBF 10828 bytes
SHA-256: cdeb77c8fcef335832c927c7969826fd71c2a165b72b1b5f85002ac3f3254378

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