Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacdb599aa785cdb…

MALICIOUS

PDF

93.0 KB Created: 2021-07-17 04:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb02eb85be17076bd2e0482ec2639574 SHA-1: de99526bf129ed4e256750aaab5904d6b713d952 SHA-256: bacdb599aa785cdb9ee220df310021fd28843c5ce986e5d72f4c641c6e3133d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, with many URLs pointing to compromised websites, including those using CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of numerous external links suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://bensonlandscape.com/editorData/file/guresufametugapoxupebum.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/heo07nj7mmlaqajj4cbdpqejg0/fapiduwefivupon.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/54121985440.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/setabovekax.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6de28ed49a---23732553796.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/72068158296.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/33966630447.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/zokolibolonimubotoragomez.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/fagasakizekedivir.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b13886a3d3---45196689775.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a8o2pc9h2157g46lhn2iaa5ho8/gujus.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/jadonaroni.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e2bee1f5---58575072992.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/27369746246.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/76040726999.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/73420981718.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0d5bbc53d---87174336034.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a388c8c06dd---70888499796.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a029fb15b0---wuzozevevefenonelales.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/dokefazejisululo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0a711e37c23a24cb1a7193326273aeaa/tujusuger.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/sisenupuxusoxijuxuzuwa.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6860e959629a082b1109b69789147ca3/78669563582.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/pesulolilodasaxisavalup.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2fad0104a---fuwonamaremiga.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/98444286493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hebrew+bible+lilithPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 19584 bytes
SHA-256: cc7a88ec4f0c65c0247ea1ce28e6831de5b74b0662ad9754945ef0b414bca77b
font_01_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 9868 bytes
SHA-256: 8ff5783eee643e0d675f6aeacc5461f5c8221eac68ba46ebb4da6fbe6254c809
font_03_sfnt_off00014e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2E 16728 bytes
SHA-256: c34032cffc1c395bb8ad4b882689f8457e832ab1b004f13e73944d4694f7b154