Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc1c8cf0e39c3ba…

MALICIOUS

PDF

132.6 KB Created: 2021-09-05 20:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 462599388100af2a2c680328b198f40e SHA-1: 1a68400443e947c8ff61409c9e402d0a05a2070d SHA-256: 6dc1c8cf0e39c3ba23a2e6bc982a115eae68e0d928e33954780f82870d5eec88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=prolegomene+a+toute+metaphysique+future+pdf PDF link annotation
    • https://fsreloading.com/userfiles/files/faxabukarabeme.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/pewuwag.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/konifuvapupiv.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0599160eb9---sotitezezuwunalafuzipagum.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0e1ccfc7---79576683159.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/paduwevegazupotufapamame.pdfIn PDF document text
    • http://orem.mn/uploads/files/30571136752.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9678a50f---99207115250.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/95833224291.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f8b852ca53a78a7292de60a8b5d43ec4/27123688183.pdfIn PDF document text
    • http://tcihk.com/userfiles/famozopomi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849eed89130---bezafuvuwof.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160854961488cd---tozukaruvex.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/13578391036.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/jujemavubogodot.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcc8c05271---vedalusidawuji.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/sugajivavoluvanil.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3171d61a4---75337210115.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb303495d1---wewonegubap.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/57001435432.pdfIn PDF document text
    • https://mkart.it/uploads/file/bolunasujegazakif.pdfIn PDF document text
    • http://fbhsclassof70.com/clients/f/f6/f6e65d48c6cf753e26882f86001d336b/File/dufep.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://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_off0001a29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A29B 20692 bytes
SHA-256: c2ea5586f0ab86eb298ccb289146e810d31cb6e160671bfb3215719c0382b6a1
font_01_sfnt_off0001d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D75A 11304 bytes
SHA-256: 7e4fde3be2805f742784e8280f0d49103c82e57483e90e6ea92046f403750fbd
font_02_sfnt_off0001f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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