Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b452f87233f979f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 20:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3d15ce028655c9560054d3ea1d6488e0 SHA-1: 80da21c7446e80a3f70c355e8b10f07934d0ccbf SHA-256: 1b452f87233f979f1b6b0317b50de1bd5a67273dd469b16127906741134f9d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link farm. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The document body is heavily obfuscated and unreadable, but the presence of PDF link farm heuristics and external URI firings indicates a likely intent to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vee0c93t0eonn8hk5ddsh0tkou/zidilasili.pdf In PDF document text
    • https://vibangthuaphatlai.net/uploads/files/totefaluvub.pdfIn PDF document text
    • http://generaldistco.com/images/file/38707002095.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/47839252544.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/43656910695.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/92221443098.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/57314960019.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_203802.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/pokalotebidonamusipawox.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/vebunegejubolepuno.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/24847016128.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/fitejenovo.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zasasinepojemivuliza.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2995546869.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed63f066e---90782369765.pdfIn PDF document text
    • https://phuquiland.com/upload/files/41619956670.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/47104997752.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95f9ef60---26338007968.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/894077367.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/fowikuvuje.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/zunemigutonidelofum.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/madulugazenij.pdfIn PDF document text
    • https://themalc.org/files/file/rakikagabuwajonam.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134408da9605---rugorabeforevelakulitak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+fishing+simulator+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/xesukavisilubeduvaro.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 17852 bytes
SHA-256: a12c2322e2778fca25b8fc4ac9744acc675c4d10da0249fac4e757db0deda43c
font_01_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 10956 bytes
SHA-256: 404596d998f48520bf841f1d31fbc731c3019d351d301cc7576c59659d7be161
font_02_sfnt_off00013539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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