Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ae24d5e5a88c02…

MALICIOUS

PDF

91.8 KB Created: 2021-09-04 04:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79060ef8025b5bb93f84a43361935b72 SHA-1: 8142e9c8907cad61c5b4348619bc2ad91363a82c SHA-256: c3ae24d5e5a88c02e63e257e7d390163b920804c439720824bbe5ce7013df262
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or potentially directing users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://avvocatoandreabruschi.it/userfiles/files/kumijeparejokawitazijev.pdf In PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/57873471783.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/38369942064.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6568e68c3a2887882278343c61dcbe0c/lagote.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/85747611181.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fobatamogokurujogep.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/98404861095.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5ae9a79c6e1f3a67f5cf85a2f04f42b2/40326180532.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/6eokictrjc2kvb0labvhsmpdv7/folunoweravabuwurag.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e6260cf2b---gefutefixiwama.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/jivifafugowimat.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/fokiwupanusalop.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/banin.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/notewegunezo.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/78444193124.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e89b88a9ff9---domoputa.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58da577d9---sosofobar.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/1168006000.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c63f2834---92994177796.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/85333633058.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c0v1s213ejnq17am2a1f1bhj94/33786966693.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c1c3cb6f---64233587936.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609005c8ba2b0---8280400147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=formulas+and+functions+in+excel+2013+pdfPDF 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_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 18336 bytes
SHA-256: ebd8a4e3d0f2f088f594169e60776f1c26ae740fb61b968ea752efbdfa4d96df
font_01_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14618 11424 bytes
SHA-256: 592c4acafa357b1e421aaec1c4c3e70f0ba625421f68c9fe19e7287bacb61ed6

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