Malicious PDF — malware analysis report

Static analysis result for SHA-256 a915dc040eec8acb…

MALICIOUS

PDF

87.4 KB Created: 2021-07-16 10:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1d9c555990143f60c96c6a36cb105162 SHA-1: fab59238b11951b34912a84e843a92cec95fcbe8 SHA-256: a915dc040eec8acb12aa47d529caa2ac619b6cbd1aa228d48cc92df7f2ea4996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdf In PDF document text
    • http://homelife-superstars.com/image/files/36790037876.pdfIn PDF document text
    • http://apvn.info/userfiles/file/ruzas.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/10103758911.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca11de3071---68175747694.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/65503104298.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430021113790164.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061523375010.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21bc395f3f---noxopaxebigusuwanig.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/85952616809.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f3112e1c818eb07792e57aca054c30dd/97424242542.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2afd012d8f1576090c85f4cd9cd7d6b7/guxinojatawodimubirone.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e561a3be33---vosemesoxo.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/b78ce3s05htee3v1nou9egdl2u/jusitedadopulerafejexini.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83412e2a65---81155649070.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fb69939c---71245464237.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/demizuvegudeluzozo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d95e2627d---vadono.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/9358948784.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/77019361007.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/579lrbmi81lbqf7b6874cpn8q1/lojogupexibafagikegofedi.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/63858703746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=solving+rational+equations+using+lcd+calculatorPDF 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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 17504 bytes
SHA-256: 5664ab8715fe49c8d387d83df92769d8d0c48899d3d652bcf87a89c27334e544
font_01_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 10932 bytes
SHA-256: 655078fccda057c31d7ca02bb178e66f19ffb71c6ca593bd8d9fff0d9f69f26c
font_02_sfnt_off0001365a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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