Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce13c1c4b050bd88…

MALICIOUS

PDF

91.3 KB Created: 2021-07-07 15:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 551b2ff7e8abd7d57f160375ba40cfef SHA-1: d4b7f74f6adf456195d05d3fa06ecc0f8535a91c SHA-256: ce13c1c4b050bd88eada7650b184f677a03dc3ce955aba72d3e39dee6bf903da
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f73dc1fc6---pumamijuvemafuwel.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0411537ec2---78633166230.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/jixigow.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zutotifepenilugenalorime.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfinr4mnt0ktjfhpprp0fjt0ba/3706676196.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gpj97i21i763dbmgiirr3nsjq4/jutufepenagukuxorezewuw.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0176142a---rafibode.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/bc20b845ed1b271170319489207f4f27/xusozemideweg.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/43450000005.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/64b60b77ce3b47bb7d481619c8bebf20/buvome.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/42620882187.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc90117bca---werimilurofexumep.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/delobuwamimijuluvujegi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f69401242---93010675252.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pnmb7o1sa536eigrqlbf8r6ol9/92443165856.pdfIn PDF document text
    • https://medtek.vn/storage/file/xobebimijowufubunajazozib.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf2473e44---15458325964.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kobedawataxojiran.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210706151042.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/67561843418.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3856393dec---pevatoropixu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kasofujosizogodutafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=debye+theory+of+specific+heat+of+solids+pdfPDF link annotation
    • https://doi.org/10.1142/9789814449540_0In 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_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 10868 bytes
SHA-256: 7dc9c78a1f96128435e1294fa82f9e9e9b37ade3e09498a709ee8784e374c22f
font_01_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 18532 bytes
SHA-256: aa5ad248ad684f5941fb04169c308a2936fe1651f2d96dd2db08a607d6ef5f87

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