Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2fc117698121be…

MALICIOUS

PDF

91.3 KB Created: 2021-08-30 18:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4970a50a8a0c9229638f943bfa02153b SHA-1: b8be3f3dcae9025d5a45bd8a1cd97fc771191f69 SHA-256: 3f2fc117698121beb1881914f313dedac8fc17356229dbd29eb404845b15a0da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://stylekd.ru/files/28729162285.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6ad962a0803b6932c095fa51d3403fbd/budetawarinevujifimared.pdf
    • https://gites-les-bardots.com/userfiles/file/vozisexavaki.pdf
    • https://loctra.net/userfiles/file/vizawezusurezujorawa.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124328ec0b2d---57528449200.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/03ed1d79cc0317f535c3f0a43f89fbb7/71694739928.pdf
    • http://actlogistic.vn/upload/editor/files/pijonubarifetuj.pdf
    • http://enricobarraco.com/files/kibedadexev.pdf
    • https://mayphotocopydogia.com/upload/files/zopotejefo.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f736d75fccb---94172966173.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed456a5d5---xetemimutanurolazif.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8efc3b4fd07fce0c15f483e2719860e/38472136720.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hqqurnsjj8qra9cvr6sbv8qv3o/26733451537.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/69261768287.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a6927cc65f7de511bcb18241f0dfeed3/60110233956.pdf
    • https://confetti-seasons.ru/upload/files/megavorijopuvesarazu.pdf
    • http://bhartiyambeohari.in/userfiles/file/89177983504.pdf
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/kegogovekupoj.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cajkpmh6kkg152dtr6o5hgp4tc/vefuvidafek.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160830aac6c457---tesulifafapituradetogisid.pdf
    • http://epoxidice.ro/mm/file/49429052590.pdf
    • https://trimix.bg/UserFiles/File/29201426243.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/36399616698.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=deliverance+to+the+captives
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce4.bin
ca6b8ef433bd1b20123315f991f446767795b4645ec1a191268d8567f8b53a79
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10540 bytes
font_01_sfnt_off000114d9.bin
a2082c6c6e77e3c36f03f8ba170163c1e1098f6bf9e487517fb0047d666863e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 18584 bytes
font_02_sfnt_off000144d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144D9 16792 bytes