Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8aed2bd8946ab5b…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 13:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1cf1574d57a75411f27fec6e33bd998f SHA-1: 581e8cd5d9649b0c1d1edd6d1268785f86a40008 SHA-256: c8aed2bd8946ab5b38cc173d7b3d50b9ca0645c1a147ac4014fd6e467486bcbc
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 0.9942

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://catamma.ru/uplcv?utm_term=hematology+case+studies+pdf PDF link annotation
    • http://geose.ru/userfiles/file/76652492640.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/37938258821.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/69174633532.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/83080738492.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/58s5it31vfgo7epi1j9ud0u7s3/64664489985.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/zewadomogutujolojivakero.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wufajag.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8b7aec1c7080c05fe8aa0f9ae722b320/79373371270.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/zuvesatuta.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/rexita.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d778943b30561162d6d8f69782cbd500/14575242876.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zajogowu.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/venafipumopiw.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mutivabemepajobugeza.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/9912708737.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611318ba82715---15991604197.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5116943f2---21199748411.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/20236922351.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/20719460940.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/mepenuvewi.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/lobasab.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d537594ae7---62713360604.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097b3eec79fc---sugiwudirafu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/196800f6ce0f03f4293f5e2cf472e482/79853763271.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 18476 bytes
SHA-256: 128e43198a97fe8760aa46b153961f5c6c89019c1111d34525d9e5cbb8342ecb
font_01_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C6 10964 bytes
SHA-256: 8f26fcd6185ff6fbf2607d14241ca225743c307965331ce318d9ce79e37a7ab8

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