Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64bbc38680471d7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 14:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fca16b0dbb32d3ef1c01b029c12c991 SHA-1: aadf96c93a140e98b7b4a79509c133a935dd4c9b SHA-256: a64bbc38680471d75e342cd04c9c19ebe3edc4d09e2bc7efb511d1c3a91030bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs, such as http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d6ca20b49---28711494379.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dtyxbpzx.com/filespath/files/20210906222825.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57c200207---veserawased.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/12641877121.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/desadetaneketitun.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614971fa37360---lolovewifiduvaretot.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210919094517.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/10315567426.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d6ca20b49---28711494379.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/9167136647.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/65578936070.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/netapasez.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/wirabinuxibe.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b1eeb9f25ea37882f437c7326c5db903/69743638033.pdfIn PDF document text
    • http://eventechsite.com/files/files/fobere.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149231bd7f04---zesozikotikunareb.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/tumenawidirajew.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/kofeb.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/57962617500.pdfIn PDF document text
    • http://precisao.org/files/files/tajunonizujina.pdfIn PDF document text
    • http://charivne.info/images/file/jorilosonejuzarulalas.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bisefulelado.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/81424974913.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-12/20210912063739796164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=install+among+us+on+pcPDF 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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 10444 bytes
SHA-256: e09dcd94b908439ec29f5b2ef0752146f2e2d6c4a4cdbd9504027e822cfdf939
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 17860 bytes
SHA-256: 5ede1941a7ba5727147981889ecdee3e70c90e6e7574e208fc4b33f975e6d068
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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