Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b2e5cc9c3d8bec…

MALICIOUS

PDF

90.4 KB Created: 2021-07-27 14:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b443e0f95ab53de91af7e1706ed7b553 SHA-1: 221e91439366417d9dddba0836932dc5f4df5ce6 SHA-256: a5b2e5cc9c3d8becc3a5b132e468ae986ffb6df4023b37b9ebf237483188ee10
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need a password to access content, likely to bypass security controls. Numerous URLs pointing to potentially compromised or disposable hosting are present, indicating a link farm designed for distributing malicious files. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zhuoer.ltd/userfiles/file/91748138742.pdf In PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/dajovosinafoj.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/49792487653.pdfIn PDF document text
    • http://aven.su/userfiles/file/28667274000.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb43a9cc6cb---sotisebenix.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7cc48eae0---49962644587.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5015894113---63449803481.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed88e029600---34042957443.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/50021ogqfn61i4jm6lq94bm294/wiropoxaz.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/74456757517.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/96540528264.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940a5b768df---jebifirazolode.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7fce680533e1018079b278969faae036/30638408731.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/irs7jl487mhad6htb4ebpn8q6e/jixofetipewotomo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qfvaj0sk0837a4gg0q0ib7q10a/jivinatovot.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3e6cbd3f9eb5c2a25bcbfb611bb302ad/jikudovoju.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/rusufibuwegogoxebevoti.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f6dc0e187dca872ec20095b314224362/6230730390.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8e3ca2c1---kigitebivovoz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gilapikapeniwurisegutuma.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6ap30aj6bm7u83mil5m78lmuaj/susapepabiwif.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/9145478828.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b2f1f4c696083b36d530865f521ae6d1/63772649701.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/8980231976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nursing+drug+handbook+2019+pdf+free+downloadPDF 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_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 11536 bytes
SHA-256: 4c25651470ce28f5ac6993f452b89b7a5e11f8649c642a108f2e38d6850add2b
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 18892 bytes
SHA-256: 273694c761ae9c31e95bf1183387ef859ba40d25826c75bd9b6273a791ba8813

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