Malicious PDF — malware analysis report

Static analysis result for SHA-256 c946a3aea2cefab4…

MALICIOUS

PDF

92.3 KB Created: 2021-06-26 23:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 37be2fefba2a85902952acfea326b9b3 SHA-1: 44e47a5f19779c5c9c9868eb50bd9b08bb9ef2df SHA-256: c946a3aea2cefab469887a6d3b925d566cd9fde68efb38d0003a3380cb242143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs, even if some are marked benign, reinforces the attack pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb900a8081---sugavukepemolow.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160901cc13203d---mosiritibolurixogazezuxev.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/54619073611.pdfIn PDF document text
    • http://soles2walk.cz/data/file/82930923388.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/xumokizivuzibu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160734ca4857f7---dixep.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4f8a886bdfd90182345a1e060d6a2fcd/45398173843.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a276d7c9af6---raviwajalabinowinula.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/nifokulonezipijoxubepu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/71879294021.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3733e4575581966dbd73d7c2cbead3f5/zopepoxadobowowunovej.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ee9bd418---84736849402.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nikikelavel.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7f453db8---tebaxesapovufuva.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb8a11a7f---xojilifu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d5c3f632---645318607.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/lumomosegi.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a644eb29d4f---berejunugevovige.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608333a6ec611---67929841175.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/nijasu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16207519136729.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/60805543322.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2b946c69b15343e40799cdd9537ec36b/baxogerikoduvejulisubegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=i+have+quit+smokingPDF 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
stream_004_off00013878.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13878 16828 bytes
SHA-256: ae9b6984111182edfc683bcf7d5dcc8866c4e8222913a7f18b0d903311779ecd
font_00_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 10764 bytes
SHA-256: 5bbfde7fb1cecd25976235f53ac77e3d98d6fd99a150d16ec2cd3fa712751f5d

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