Malicious PDF — malware analysis report

Static analysis result for SHA-256 87adf230e238b5ab…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 22:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3826439f9fa26a002114c1e3dde94e1 SHA-1: e19e8f8a193ac3a46e5d28f97461640cf6927730 SHA-256: 87adf230e238b5ab3b9451f6835e04889b15597c72c970e632b9435a7116709a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of a compromised CMS upload link further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=how+to+tell+who+viewed+your+instagram PDF link annotation
    • http://digifast.cz/userfiles/demegifudizidekadukituko.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/96988427825.pdfIn PDF document text
    • http://charontrade.hu/data/file/10902686195.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161362a6d717de---55664893143.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/resibuvulutuwutewu.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tifidagivewusizabe.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/29605727683.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/janofutuveremow.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lazududolomawulodexusuvom.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/kofoguxobores.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/jisugajolinuvilux.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/38290635726.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/3920675097.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/soxuf.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/19692748426.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5016021ee91f0e0487f2e4542c8af3e8/43360391224.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/8366767766.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a010afc9a---98322777327.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902125022.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/jitarimerol.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/natadupigajezabuditi.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/fixomuvusumozizunixumepij.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/11778203083.pdfIn PDF document text
    • http://4darchitecture.org/img/all/mefanutesefuganatatixak.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb82424af---tavatitemaregux.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 11052 bytes
SHA-256: b3535cf30dd1235604687cd70d61a1be16350d6a69da157c9879060eb9284514
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 17724 bytes
SHA-256: 62e466a47ca7ce5739321a981a5cd30bf6f336376018e55e1846e8488a4a41a8
font_02_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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