Malicious PDF — malware analysis report

Static analysis result for SHA-256 d771bacd3deacd5a…

MALICIOUS

PDF

99.8 KB Created: 2021-09-01 00:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbe8d40371dfa9d6541bb2859bba370b SHA-1: b1776811c1545bb5042ea886b49bb3971cb5b70f SHA-256: d771bacd3deacd5a4e688366ee7b44315cb5e0a568bdfc7c4998f9485304fc48
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or redirection attack. The embedded URLs, while some are marked benign, are part of a larger pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://apsencollege.org/test/fckeditor/file/89254891238.pdf In PDF document text
    • http://travelshops.pl/userfiles/file/37688980285.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/nifiwalujizumiv.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/86617219086.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1dqhomuaisv9v7095k22oqhf6j/bekexavedaxavenomupaduti.pdfIn PDF document text
    • https://arerp.kr/data/file///senosarimevunopax.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f006c64aedc---mudituwerunonenugimilir.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a368fc61---naxomivuxivu.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/57321218983.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/48281655487.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe01f1f77---fidesuruj.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/maforajefibisupemaso.pdfIn PDF document text
    • http://premium-h.info/files/files/14728693933.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/34337724343.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/kenuxizerurewozivaxefa.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/tunenubevizovoba.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f369c766c2---dozabuvakej.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073300f57462---4122678265.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/65754144801.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/venikizifemelupil.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a630947c5abf65acb5c9517d9290dfe9/52705716391.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0lidapa2ulvfmblohl67br03l7/fojenogegizoledixinijowu.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/42395070640.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/43066895128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=leadership+without+easy+answers+ronald+heifetzPDF 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_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 19388 bytes
SHA-256: 05a6722985b59bb0c490a3648e5793bb7dc096c1eb148deda91a64227d89e60e
font_01_sfnt_off00014fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAE 10912 bytes
SHA-256: afa14a0d847a2fd452b9aa6101fac8b211cc33e96fdcb190b479375c44fd1f11
font_02_sfnt_off000168f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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