Malicious PDF — malware analysis report

Static analysis result for SHA-256 829723e2570bcc28…

MALICIOUS

PDF

69.2 KB Created: 2021-09-15 09:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e723a369ce59996683ee3b784e1f063 SHA-1: eed573acba4572565733c6762ff45d8662b6322d SHA-256: 829723e2570bcc28dd6b2d9637afbf0400cb80102f4faaea5747ae78b8e9bad7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves luring users to external sites, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://resttour.com/images/userfiles/files/tiwilisiteramawuraw.pdf In PDF document text
    • http://sangjeom.com/userfiles/file///peposuvi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e03227e---54140352712.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/muguripem.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/52615776493.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vidakuturegadofuronir.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/90570861353.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cea64a2b---fogewi.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/nezunupaxibosaguwijam.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/24830399510.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/94615352217.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/75011860131.pdfIn PDF document text
    • https://latework.cz/soubory/raxivoxa.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/3670484805.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/90122876777.pdfIn PDF document text
    • http://holzbau-napetschnig.at/belizugatufawanupuko.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/vedozopujejatozam.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bud089cu5a4998f7ncsilvd1td/vapesazakukilerafama.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/pozijuroborinikeguriv.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/90599163287.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/zesusemizojimefetirun.pdfIn PDF document text
    • http://atya.eu/files/file/fugetumo.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/62458479285.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4813fcf792451d8a00dab4d591cd4dc/91882681983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+view+private+instagram+profiles+without+following+no+survey+2020PDF 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_off0000b063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB063 14328 bytes
SHA-256: e026faf87d150fa3bc9a56ceeaa20ac28c97bbeb1ad865c643cc8ef42ec792e9
font_01_sfnt_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 11404 bytes
SHA-256: d3414b9eca749d2daeec313ae854e12beebdd84cd5eeedb094e43f323e27b2a9