Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d84acc1f16fcdb…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 18:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5f6ca91d0259b35bee9d440eff3d373d SHA-1: aa487feb7eef298a5c00ebe5805d0add089df77a SHA-256: 66d84acc1f16fcdbcd16dd721121e9ab13215eb90308df82b2d5ee80d81dc000
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tipiland.net/upload/file/tudutobirelumaguze.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2707d63768---10720555588.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b034a6ae4c7---xodebutomibor.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/bisuxas.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cda21092845868793598978e5f3335eb/gukaxabovop.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cdfe4d49be55156b71ac51ca8bb4ace4/87688581002.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609422a7e88dd---51371595214.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e3e6efd837c89f6af884703da5ffd279/dukekoxol.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/42f91b68453ecb5e3e785e5855265404/sozonijofifajivibi.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/lokumifov.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa2125f72818d896014cd4d25083fd96/pumesavepoduni.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/71674258753.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8ur9s6c31d5ladgdmeh4dtk2i4/87652716856.pdfIn PDF document text
    • http://cwesp.biz/upload/file/genulejovutego.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/52ddb7b8c28938048e621a1faffb0ff3/fomanuditewelane.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6f6b7270573c73341428bea9e893be49/woburobuto.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbacf4d6e91---24455936618.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67f4110da---xozovunipudoxeropikejabup.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03081abce---gunogurijeposufu.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/79404708062.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qlkk2nlhis8lpnhjh422ntplkk/46329981479.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609babfa1505f---79613825545.pdfIn PDF document text
    • http://sqx.cc/upImgFile/file/20210513175529.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/o3jgu5fu98l2f88guff832ksom/82014486812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=new+windows+snipping+toolPDF 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_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 17228 bytes
SHA-256: 984d51e82ba1aa65dc713598aa77821546a107d2afdc8773c15bc5bd20fb6a9a
font_01_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AF 10368 bytes
SHA-256: 775fbe7211cb539529a3f39c3da6267c3474c621abce4000636aa2a50e910d56