Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c507e3d8720a1d…

MALICIOUS

PDF

94.8 KB Created: 2021-09-06 02:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b2907a2930c83a3779c49f0a6de7b02 SHA-1: cafb18567e547d55a739ab81e22f1d7fc1f54fc9 SHA-256: a1c507e3d8720a1d13abeda93be8f98f3762059ac684c2f8565c01d6298c7a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded URLs and the use of compromised CMS upload storage for hosting links further support a phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=aws+certified+cloud+practitioner+dumps+pdf+free PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e1cb67ca---rilatinu.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/95272130503.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/46369629445.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/rilomadubamogako.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a60ca7145---dupijujavowosijib.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/sugumedelenujobu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb0d41a0f5---31004923194.pdfIn PDF document text
    • https://motacademy.it/file/75090273138.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3e0eb0b66738da61a690b11eb478797b/xazolafijebejazaban.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d1e8800508af8d1de0adddc7e600d413/67493548249.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108251134224862.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23b59a5d76---12424693154.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/30474453583.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210803_173516.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/naupqvcq73v1apjsdnjjabimp0/najebej.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1adfebb1027be00e36e6a881c3274d7b/66207328497.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/44426455844.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/13342159776.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bb9c3a06d23379d81a02e833aa1b67c6/nedumavewur.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/16700899247.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161274437aa11f---46280039593.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/43c6ce96c4a587fc6ebe9399dc4d8117/kelike.pdfIn PDF document text
    • https://olterus.com/contents//files/42529650342.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/27328074650.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/11879972367.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_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 18516 bytes
SHA-256: d146de196010207282ad026dfc91c9ded9861f0be3e9439786d44c7ff447e46d
font_01_sfnt_off00013ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B9 10948 bytes
SHA-256: ed43daddb3ef3e1c5cc592bfae7cbc31cccf2d941315e580c760eaf28a0fa195

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