Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd228834de85dd5…

MALICIOUS

PDF

88.7 KB Created: 2021-07-15 09:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 189372575778ce3dc7222d1b9fa01b7f SHA-1: 5d55a5e89e46f157359d8c5736526815588c06a6 SHA-256: 8cd228834de85dd5518db0a5acdb65e4b8e900264445ff28c570d2e4340b4012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs that point to compromised CMS uploads and disposable hosting, likely to obscure the final destination. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b54fb5e39479f7784beac014a1fa5b35/74402782016.pdf In PDF document text
    • https://leo.tw/upload/ckeditor/files/95938846346.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/wolubipesimudaro.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d2c98d6a1b7c965fd9c82c61f9fcf6e8/48745357259.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/parisurazenaxerote.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/86987144461.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/37903202879.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tiwetikozixonuwariwimiwox.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f901d116---16276441567.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a93c73674fe---jotefezurutidisafilufaja.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/304c6580c65a25777c11b33e26787b91/nodukuvepa.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/43137473508.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/rojelepuvaw.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa988b81ea8---vivizajuwudozebarerep.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/gkri7irap0ku6h1lhdg468gla9/pofinixidelapizogudixez.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/xubawapanupopidamewud.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0b3f9d94b98ad08d710db21a5e305357/bibinefepozapopakovawena.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/muratizatusoladuram.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/xinupegiziwaparakinor.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/36365098770.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7dfb5152f8ee69d81e45f437b751ba65/jobosopisajubefigapazite.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608399fc09bd1---zefebajogesimefufagizilax.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061816494373499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=create+array+without+size+javaPDF 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_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 16596 bytes
SHA-256: 52a11e7a7e83340ebda0136596478eb9197f24c461c97477da7f32b9da22786a
font_01_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 10640 bytes
SHA-256: 1dda010eaa091e346319648b5f9dc53291b07c7a829b6358574a429333c009f4
font_02_sfnt_off00013db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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