Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0eb28962b266f42…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 06:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9adf3b9ac70c6cacfca3c757b1422797 SHA-1: 4d127be7ff6ceba4aec351db0793bd1751a8a93c SHA-256: f0eb28962b266f420053a12078c87d1cfea65953a4ea10f9750f5f6f02fb3e38
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. This suggests the document is designed to lure users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/29e36ad2da54def4ac0d7685678a2c55/vogag.pdf In PDF document text
    • http://teormech.ru/teormech/usrimg/file/66763292860.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/55172225936.pdfIn PDF document text
    • https://hoongnau.com/upload/files/17493963205.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8a62a0432786a785b2c65e800336699b/zejubozujitujuxitudezute.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/tavonewagawipidefuf.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d756d74a07d---91683547071.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/91346993729.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/90555976358.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/3756318415.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfbe15884---78825241893.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bf71c660---kivufopiwimedifun.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca67e510cd---giwitipifad.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/5684563575.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/36b8eec69360314e31acb71b105de2e4/71736994834.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/divobewefa.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/vezakekewofo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52dd10aa2---19282566719.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/tadebijasu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8c8cb49c3affcd6db2c8c74c5ef8f6d6/nubixijezofamaw.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a864e483f8---40930035725.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d24be9fe3---datiz.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/48148365095.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160794bbb56087---18111080048.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/90566437202.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210624_24A53186A03DDB09.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=trade+off+between+equity+and+efficiency+in+taxation+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_off0000b55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 11052 bytes
SHA-256: 92a1c1e0834d9b7c68733e41e044af1a0410de8c6e1b75891076fb5046bd9dd7
font_01_sfnt_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 15316 bytes
SHA-256: 258b161913758e8bc01e4d6f1aad94ccd0561d54fadd2106e118aa4cfeb36882
font_02_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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