Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83a3a095a196a0e…

MALICIOUS

PDF

85.1 KB Created: 2021-10-11 00:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 657b35d6058405068f86d82a32f1acbd SHA-1: 1b8a2fd8bc090e5c61adc48521e62ff0a92c35ea SHA-256: e83a3a095a196a0ece86ed9b652b822502ded933f7116f13d7df713482c39d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=how+many+lucky+pokemon+can+you+get+a+day PDF link annotation
    • https://blokhol.com/upload/files/ganan.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/jawavinopuba.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5451c4d5f498de43a27a67f892e76bbc/segaj.pdfIn PDF document text
    • https://taperagi.com/contents/files/fiwerukufilek.pdfIn PDF document text
    • https://senfina.top/uploads/files/22937310715.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/98916046287.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///vemupapewobivetu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/rebesimavamafamaworemu.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/getufipazez.pdfIn PDF document text
    • http://esteel.my/userfiles/file/rudutoli.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/30899288432.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1c0cb1b32c48c9d81ed1eeabded885c8/nogowademigomofitafidida.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614087170ac43---31749898099.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/53120464525.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/witekodenibefamezanufoweg.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/89696064753.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0359760fc---juxiliwufasadamobazus.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8ad98038d3c9199e1defa4e5fb11883f/tuxatiwetaroxinexu.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/5140325604.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/tafenexafibofepiwod.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615bbfaad588c---68504737294.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/xafizobakipakuxijudazu.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/55182863696.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 10880 bytes
SHA-256: 1ad5f596d6dc75d8f87007a4f158756e187889596ddf35632b1c697d9c91e9e4
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 19600 bytes
SHA-256: 50ac13041ecf25f462d7bed7ed7fc38d3cf6c7257cdacd30e97e425c2d5b9449

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