Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fee7310d836bbff…

MALICIOUS

PDF

73.3 KB Created: 2021-07-04 07:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06ef5243feaa1cdfc8fc9874783ca841 SHA-1: 31bfa0c7c17e480d2140afcbb9569e3ad1bfe482 SHA-256: 4fee7310d836bbffff902384318970277f9bc1676e0bea3e49dbf46299f5ad12
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the numerous external links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc6b3272a---rumexabaganarobomu.pdf In PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/751e87ada255f9dd87206da4d3986781/69480944759.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160920794194d6---nupabunodo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/a9sdu2a2ent0u6thoeqnetocuo/64530239074.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/sirufinuk.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cd6a9be43620de3e3ace8d0a62bbf001/wizikoletepakofibetuja.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/19735094572.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5eb3d84a---39050272874.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/gagiluxagujetow.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/jopuguza.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/kitubomivexudaxo.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/gadote.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/91810007708.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e932884c---wofasagojozukexulafudis.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tidegilemebowutuvoj.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080811570d77---3480525215.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8b80fbaf---57303874772.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/93998596371.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ed4ff61602f8a7fd1f3ee9829b577401/68019524368.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e6286aefe351b96c361ffa714527845/87006876298.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/rewulefeferavav.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c16625d1---dobewexeweninoxesu.pdfIn PDF document text
    • http://iltorg.ru/upload/file/towoda.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/21536162488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=battery+reconditioning+reviewPDF 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_off0000bf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 10652 bytes
SHA-256: a87b045a8b9fbc6fa7760af06b72ecdf083c50315313cd51385564983398eb23
font_02_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 15872 bytes
SHA-256: c80c9316e67195509766ef9d9f50ef4a3be966ea1ed400502fceff4bad9cbb2b

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