Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5198c31f74ac8a2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 01:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b4ae6504e94787086c7564496c0a9b7 SHA-1: 7d5865470d1ecf9160ac2a73c091b8b3e0e3ce18 SHA-256: a5198c31f74ac8a220bfb68db549ef283f45c2a45d93acb3bd3fd7cf592846ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The file also functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, likely intended to distribute malware or facilitate phishing. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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 https://laborke.ru/uplcv?utm_term=singular+nouns+worksheet PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3c5f51240---31854882818.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4d4659d0---buwozekixabuno.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc44bb2f6c---82893054910.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/neguweguzolijomagu.pdfIn PDF document text
    • http://bdsductri.com/upload/files/mabaxu.pdfIn PDF document text
    • https://dintek.eu/uploads/file/7794290894.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/15884778521.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jgvrr4g1ecmlr3qjuctbkk4nsl/26249537226.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jamafafilemuxebebe.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/jadijazut.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b699b73b45---kavuzonisokemuxofulagik.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f203qaf18p8msb5kf0b9eukd1m/nipoxaki.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/pexewurizurigo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xawikiwokovix.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/32102373599.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/48948510598.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/675c64889be69ef30d7c0cfb38841172/41472606595.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/h6dtq5ruuruo6bas4k46a9sbm5/26817726564.pdfIn PDF document text
    • http://polipack.ru/content/file/59305247472.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/zetubadivi.pdfIn PDF document text
    • http://inistor.com/ufiles/files/36086913817.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20653e8eb8---86807191924.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b68a973c2948129c72d913424434ae71/gulivoxirokutadofolezubu.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_off0000cf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 10740 bytes
SHA-256: 83e692d7bf89dd65de7ce5a50f6e175598098c6a96535d1b0351a5e1ea025c74
font_01_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 17980 bytes
SHA-256: 52888e942783f07359001fdf7d5323da762875646f42f4462bf3c3c76719bc8f

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