Malicious PDF — malware analysis report

Static analysis result for SHA-256 d413ec7a2c5846b4…

MALICIOUS

PDF

93.5 KB Created: 2021-06-27 22:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 374ef61ea3df54aca9c9d7fbfeabafb5 SHA-1: 755d8580c7a75d4a2a29841f6f0c50d622dda5f7 SHA-256: d413ec7a2c5846b43830ad01eb5054290cde00e8a58e6e5ae9b54e5ea0f22fc4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://sjar-tech.com/uploadfile/file///2021060622472735.pdf In PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/43d46dfd3982e31fd9fd03a49868f82b/76652210402.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/topimezurobep.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f224bc7415---sawimumu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dff38bc73---72368026665.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077786bd1d13---52304606020.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77df8803b---wenunofonilopaguf.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00601a059---fewasizesikasinojowika.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098257e70ed5---wibesugopefixawawomil.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ruvijo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6515b44e1eb7d6cbaa26ccd3bb86b972/xadiretijoragujoje.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d627ce7ef4---dilizixaj.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/pelukurowubuzobagodu.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210625041452_98619.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9cdb41162a05dac358b73926b3f14a5f/43528341235.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba0bd4ef2---53217478493.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b566ce35fd1---41180409871.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/wemekonobetosusobojojuga.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/nodarosif.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/veduvekaxifolojuxibilutat.pdfIn PDF document text
    • https://grancom.by/upload/docs/29755836064.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/44d7482c90a35c0ce7443a0ed4e2ee46/18137789546.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/55278927526.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/2562651708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mathxl+for+school+answersPDF 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_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 16972 bytes
SHA-256: ba80bd5ce1b2a37d4705af3f7360f7366d8d59f5b76e984eac3279b11b12e66d
font_01_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001509c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509C 10524 bytes
SHA-256: 37f82197e4366c9baa955a85e1a7bffaafe2b6345c3370acf1643476d0c5cb4c

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