Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9cddb197e07d90…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 08:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8953172eb397feec6465c6320089bd6 SHA-1: 1d816ca2c9e9b6f5055e0ee08e486b156941c386 SHA-256: fc9cddb197e07d901a59d07f52039e87dd9abeeca8cdc359bc130225ef493a30
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://garglob.ru/uplcv?utm_term=eca+atualizada+2018+pdf PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fbd8ac4d---guxenosetinabu.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/50033584524.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c09f434eb4c---27140538973.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/12455738952.pdfIn PDF document text
    • http://sial.pl/galeria/file/22472860858.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/75083716553.pdfIn PDF document text
    • https://shrisaiexport.com/lightspeedweb1/file/guzemuxivapi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ca5c7da8---lobobuvaturoxawi.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/24630743493.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/18612520268.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a928c1a4ee1---20243347929.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e05e38176e5---92718836607.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607624cd7f66a---16187568073.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/xawomi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e95821469---79301055066.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/34452303579.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc32cbe6b3---xafijoxozilewuvowadiwu.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/dumedubudajijabi.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210626052301.pdfIn PDF document text
    • http://sns.hu/_user/file/sesakogurake.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/56283329902.pdfIn PDF document text
    • https://petala.gr/userfiles/file/tojovuxabisonew.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9caeb38da6325dbd89f3eb50876033b0/mefemesin.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/djlvdju7aokqdfrs3okfj41i80/rivafurenebilu.pdfIn PDF document text
    • 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 10632 bytes
SHA-256: 8baf921d9e5b276f1eaca0b5b480b0abf99251933a193682e59697c090d3afc5
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 19732 bytes
SHA-256: 69e6a21ee0bda04705e5e2b8871076a02714cdca0ebcfeb7e9929c0be607ffec
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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