Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cef24305d79665…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 14:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fc0fabb61bd0bf3d5f226c37394e9df SHA-1: 5104141bf73f0d65a170844ae55ece74dd4b9114 SHA-256: 53cef24305d79665d739ab0de5932cf64387dfb516ef683cece6977c73647da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The primary purpose appears to be directing users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fc5fu4eqpqlu5a00kral72l88/8404511110.pdf In PDF document text
    • https://afayl.com/userfiles/file/34475891765.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/19397651099.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/77048254222.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/47741476099.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/83641926166.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7a0b2b4078a458be887425f4c0aa8bae/80751547494.pdfIn PDF document text
    • http://vce34.ru/attachments/file/25471707959.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/47138795123.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b75d9c8020f---37390105241.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/719895243.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/51823767875.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/pojokobepoxuzepox.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/rilopawezozuv.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/jamekopevabapitox.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/12825885242.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/rebexoni.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/9564657326.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d28fe047e33---46228135653.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7ff0d8749---84863217355.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/71951792083.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d463467cb3d---vagaduwu.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/94332735753.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1eb2cf6824e65e80f7c7cba87ad5c0cd/35304785849.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/sikizevefeja.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0ac14f29---sapuzavusidafog.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbcbd12d55---xewabaterivitezaximawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=savage+worlds+adventure+edition+core+rules+pdfPDF 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_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 11124 bytes
SHA-256: 60d0f14be00757728654d7264c55eb3e4563be2851b7db6de557c68439f0aeac
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 20492 bytes
SHA-256: bd464c46ed2ff7141e66178c717f9b5efe9bdea3d07804e2628f548872921a25
font_02_sfnt_off00014099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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