Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4600c61562d48f…

MALICIOUS

PDF

101.3 KB Created: 2021-09-04 09:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1564bf05b779cc69d9b94247ee607ddc SHA-1: 18deb434002854de608373a3ad508d29ca4fd05d SHA-256: ec4600c61562d48f4d304adbf47de1c283fc4075d286f829dd32f082638ab5d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://crysiq.ru/uplcv?utm_term=industrial+sociology+pdf+notes PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ngvlfdrmdcak4vd59gk69720p1/tejumiwesi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce070d7f5d---6234471056.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/lukojopufuzikuvomotisag.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607968953819c---toxijovo.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/46752976693.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/3921133076.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/keseranarafokovugi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96a9a528f---22983015399.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/rawux.pdfIn PDF document text
    • http://cityfate.com/files/files/jupemarexisuxikugunavimi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mvlnq6phk25rkabiqbrdkh4brl/72320122483.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hrb0nk13u38jfurdp24hlpg4fn/80054448082.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/sugesepebobuvuzakulad.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/69a97adfbed6aacd4eaeeaba5652d617/66182430269.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/kumaseti.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2fe8b04b065ccfbe1ef859f445fb31a2/mowefa.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/btujfjficrni8hsr7plgbl662l/23795893835.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50b6a32b1---40704992058.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/xevovemefekugalim.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/wanepupof.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/xetosukamalipuroduguji.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/eb5ec801cd4b569f0c7938c90f7e15ea/jolux.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/74423357746.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/36527681688.pdfIn PDF document text
    • http://lawngo.net/fckfiles/vebeziwajup.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/kodunuros.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_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 17916 bytes
SHA-256: 7acf38a9dba032f1ff6a7a51ad06874d24e9a52a32e05a4d6e638384cc9fb4e3
font_02_sfnt_off00016e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E00 10960 bytes
SHA-256: d1c9231eb1d8ea170b888689ee636131f8273bd57169171d847075b6275ce7b3

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