Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae417a50bcd8b1f…

MALICIOUS

PDF

83.0 KB Created: 2021-08-24 17:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f1cb25ebd7b50ae6f14b16afdb6b166 SHA-1: 470a3023e36b96ffca2bf80b6a826b3ab13b6de0 SHA-256: 5ae417a50bcd8b1f2e3971bfdb07fc8f1dbcc0a1d173a75f920f610d508b3c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160713333ad438---worarigidadenazavoni.pdf In PDF document text
    • http://accronline.com/userfiles/file/jazamosexedevu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/m9ueh4vdoumd9keiki9upggvff/59577981076.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///13008334978.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ffafde0ed---73759648405.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zenetidewu.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/fazuzurofib.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/67002741669.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d595e565a1---97789390896.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/098170f9395cee948c6943c5e13639c3/denenawen.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d48531ae6bd---zujuleledikiwolapokurez.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/tipofujenotufifamomuni.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/zitapikiratilixebupezow.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210617_183025.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/gewoxuwilebabevulaso.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/44723557863.pdfIn PDF document text
    • https://computerzone.pk/file/topamufemidojowor.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/67388314366.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/47082859663.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/palisetegodunuzatibe.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ba32204df---35993690398.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/81941470759.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/nepejemigijujagudasiw.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/dofezujatewekoforamafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=effective+techniques+for+dealing+with+highly+resistant+clients+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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 11392 bytes
SHA-256: 534109805ec7703b4cb2670ca9b019bc733b8d00acabacb8045e7dfe9b3e17f4
font_02_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 16632 bytes
SHA-256: 558042487111a825e088e8c3b56236f1f604ee7fa004dec8769ef9914431e150