Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ae157e541f6f2f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-06 10:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b6562c559243bb16c3795009253daf0 SHA-1: 112eb6326ffae778387fb804823d6619737c0aa0 SHA-256: e2ae157e541f6f2fe8436923ff274c2e19b42b7b68d8e923991fdfa1bd99da76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9da8c282c6cab5024220e8dc5696b623/34858296686.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c6ebb643704757adbc873b4bed6532ef/8389601816.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/muvoz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tulisigopokesi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/39708343966.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/39673193796.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/98926139718.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/1123410881.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5b9bef975be63ec048d89b95ec15a23d/63642012103.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/73877109667.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06d700b42---89429749350.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/5752587380.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2495a44bda98e46afba0d4e64725ca00/sofusenefagurisi.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zefufijud.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/76440829698.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/50009077028.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kofataxilamofe.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsqkhua78osdh7omia4sftf1q2/rutepukojor.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/92496828067.pdfIn PDF document text
    • http://614move.com/clients/4890/File/jelamizonisapazizapekixu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/zerapekuvuvorubezu.pdfIn PDF document text
    • http://kelvista.lt/images/files/fakunenalelonisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=understanding+and+using+english+grammar+third+edition+pdfPDF 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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 18476 bytes
SHA-256: b1e98641aa346be10ef7966a841cf83c0ef740eb5e4d48a7904939e3a2493802
font_02_sfnt_off0001371b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371B 11052 bytes
SHA-256: dc2d3642bc9fed2c8f30e185981672c0e59fc38da8db70176cd35cfb1c72e88e