Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e41546204d7dc6…

MALICIOUS

PDF

91.6 KB Created: 2021-09-15 13:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a0828f60cb1ddccf951104960ffa53e SHA-1: 653ee40b6cc82825540228b7480eb1b59dfa095d SHA-256: b9e41546204d7dc62f6728c466ee5e07a0eaaafb128fb9a0aeec68cf4e13b79d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests it leverages compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://combatkuntao.com/ckeditor/ckfinder/userfiles/files/wiputazoniwanaf.pdf In PDF document text
    • http://synergienetwork.net/userfiles/file/xajurolebep.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210907215339.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/kuxenidote.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613206294713f---wazegigosakasaxep.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/gogivize.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/teguxosowenizomixawazu.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/piwebapumaxonusejel.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/31567686285.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b5d0ee39---2562906735.pdfIn PDF document text
    • https://europartner2.pl/uploads/kilapolilogipugabuwo.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/43551601877.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6eba44d0a---tezevin.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/rirexixinejemu.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210902110255_bm9qb2thZ2F6b3ZvZG9sZXRhcGVmdWdh.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/1881993481.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/57498832235.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/fokuwutuvulireliweled.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/32046450635.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/43026325946.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/pagawavuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+android+games+that+are+not+in+play+storePDF 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_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 18208 bytes
SHA-256: 56fd0ac167779f1ee76eeadc11dee7dd3d0d24145b659c3d202af1c4ef16c0f4
font_01_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14794 11008 bytes
SHA-256: 105ad3a5d64c886bb48e10f34dad2cd3519547a3a0a0b2fb06a5782203312797

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