Malicious PDF — malware analysis report

Static analysis result for SHA-256 455eb5e4af97db11…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 19:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9554295a604451cfaf5fbb3b505d4b06 SHA-1: 0236c60a3d4a5ccf8bdcb33cade9f4f47e39621d SHA-256: 455eb5e4af97db1111a395624f77fbac9a2f371f5357a32a9efc10b843cc050c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://satyavnetworks.com/fck_upload_images/file/xefoxuz.pdf In PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/54169553560.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/vakonoba.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/78003441100.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/bizogijarup.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/di2m188i0kb0dd4fislr64uj82/rififuruzobuluguvegiveja.pdfIn PDF document text
    • https://greenways.at/userfiles/file/35168355269.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/90528229549.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/buxigubabijasesugomagage.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/bowejepibiwibu.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/91210252964.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/60846557293.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sesafijikotusatim.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161318e890fc36---3022973835.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/75496751275.pdfIn PDF document text
    • http://rld-carbon.ru/file/96477655882.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132b7ca1ae71---felapefofavujaninibidot.pdfIn PDF document text
    • https://kapefashion.com/files/files/lezadimibid.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/42512612694.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613927a86c934---76101662791.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/be9c4ac0e947206c6b7cff16a4307d10/jemuk.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/jisowexowabitometugugufe.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/27877733896.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/25090797726.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903134525821274.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/42521387356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=five+nights+at+freddy%27s+evolution+apkPDF 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_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 18136 bytes
SHA-256: b8bd78cf57e670df113be06bb99604157fe9e4d0b3b062fe9d2b8392e92208db
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 11160 bytes
SHA-256: 244e29bfb4aad153a1d2e37fd3ee7385729be93020b0b899d8f66ff5c0700f18