Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3179ea731da554a…

MALICIOUS

PDF

101.1 KB Created: 2021-08-21 00:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8189b30e1eccb8555bac68311d95811 SHA-1: 6267a6ac51a6950dad61181116214b4cc76f51dd SHA-256: d3179ea731da554af7868cf41f0e4ce6fb26c8dc69c4929a7c6b1dd8c9703f54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and compromised CMS upload links points to a sophisticated distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=ragnarok+m+eternal+love+job+build+guide+knight PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91ea0cf4a---54099750389.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609305fe2c4f1---xetobo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4531b42731---sefelesutejamini.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ede96f16891---kixugobixe.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/depanapuvivifixajaweko.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0b85825e3757458c2074954a2a75764/puvunugugak.pdfIn PDF document text
    • https://coluer.ir/documents/file/xomepukinivekirupizikin.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/33220265674.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/wezuderapuxuditavexu.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nefofur.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1qsnso02u1ucrg7huttp6s9vu4/19217439886.pdfIn PDF document text
    • https://blugarden.eu/file/nigix.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d247fe7d662---rivuxiluvisoduruxugu.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/79126352593.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2e216bd0---46574418916.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/26657617755.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/47080664295.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/dekoxudikakalesaretis.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/ginifi.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/nalime.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/1623228621.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/08fc8b1e066aa0f93980e7635b5fd8c5/pesije.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/bfba62c112be37904db4f1d68d161710/napetijokumuzetani.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/92901719389.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/jituwobusoronav.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed77ab669e---31497279548.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 18352 bytes
SHA-256: 8deb7e2873ef2bf2fecbd747377e68a8072d344be738e49c5048e6cc236d8ca8
font_01_sfnt_off000141c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D3 4672 bytes
SHA-256: c1192c5fcb968199f457789ca52f10325305fb0b29b4a8460eb38bdd44a0c1b1
font_03_sfnt_off00016ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD8 11100 bytes
SHA-256: 18255a76eeb0905e4604f9d6fd285ebaaf4e5ce9afc2036e58c87fb6d970a312

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