Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d82609f5d10362…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 04:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9719c2e3eac46f45c2bd7aaefce0209e SHA-1: 7a4d64629a26d6f3369c1462491bbd78a932bf05 SHA-256: 37d82609f5d1036288b44c2afad9c79a289d315ada0cd55a9bc82c237b27cafb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=objective+agronomy+book+pdf PDF link annotation
    • http://monkey-do.net/userfiles/file/66770524586.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3628bcd7c6---lonopupesemonovapo.pdfIn PDF document text
    • http://xprchemical.com/upload/files/2367755540.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/40853335598.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/154368a9f187aa88d79d81962da1f7c6/6878131971.pdfIn PDF document text
    • https://triosms.com/userfiles/file/jezupuzilumobes.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/speaokubcf9bg6ns7eb8uvr9ae/zavoditijogofese.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/84c70fa8938dc20033d4cbfd8ca2b76c/dowazikemefavemojima.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/32305403615.pdfIn PDF document text
    • http://sooclose.eu/upload/File/35346046354.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc590a8d05f---89660670493.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/j2cdpa16l0j7sf0uu5uiag3ft1/garolisediwigakofiv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f929b7c2d---28987180232.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/tezovejumetofede.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/24920960125.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/79528441198.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4614ade4a0---xetalimagewapuxozadewa.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/87455650898.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/xevidexavemopugoraw.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/zasuvapukusoweg.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/92329185324.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/negexowazilofik.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114b9312aa36---kututidu.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/lajukevekugolejumagomesif.pdfIn 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_off0000b8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EF 17284 bytes
SHA-256: 620ef99fedcc69ee1cba28914a16107e435b28e4ba247471c58fd3a67591f7fe
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 11316 bytes
SHA-256: a57ce857d5b638f4f691cb8222292711ae7eb0e9a7458954fd9ebe08f9a7ffb3
font_02_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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