Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fee86e13d48c2b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 05:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: f7e1f0162de97db6d394c23bee987a63 SHA-1: c4cfce1ff2ff441913498967640769292bbd7912 SHA-256: b4fee86e13d48c2b38d566ad7e203267f46f3163dae3974ad4d6a5d2fdb3c500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/44a3e1e05be6fd343b5d4346f16c8d4e/sizijapudugul.pdf In PDF document text
    • https://tectrongim.com/uploads/files/wuripetelowifiniwudopino.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/zabuzeful.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb6870b1f---sezuzagewutimuxo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/15592327513.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f77d6fcc05e2eacc362169f8cdc880e1/xonegewejop.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094842b41610---73789170091.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xawutugukisetijo.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/zogiletafedanekalono.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/lurebosumot.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085290e72a46---78457730551.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/pazixaburelodokoligod.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/wudakuluwonumagawujuvi.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/40686910073.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/24198309523.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d1ff00231---40518705130.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/47867286987.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4bb91cb2c6ae5329801a1ee4be623ab3/20671588871.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd137877cf---33720802539.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rasokufajigufu.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/xosikiruna.pdfIn PDF document text
    • https://somogyplusz.hu/files/74933176555.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/18743832357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ways+to+reduce+budget+deficit+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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 18764 bytes
SHA-256: 6c545846475fab1647238489e017e27f5cc46697c57ec46ea8288312f8d0ea43
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 10992 bytes
SHA-256: 4d43dfb1805f21fe5ede0cbf7f704e3a0bc0e9375515ecb17b7afb03bcc7896c
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1