Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec56f27403eff34…

MALICIOUS

PDF

86.8 KB Created: 2021-08-05 11:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d934d27a3fd713d906b2567f3bfd0f8c SHA-1: dc89b79668d8d58ee3e59c1359815aa85c82bea9 SHA-256: dec56f27403eff34967f57def388b92038f5d1ff202de9597350cda1970d4699
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=how+to+change+four+digit+code+on+schlage+door+lock PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd25f5b5e7---tezixidito.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/97805925570.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dudisinador.pdfIn PDF document text
    • https://huaku3c.tw/uploads//files/202108040241274234.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb79e90438---jedakodefizesolu.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/51997719096.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6303aa889---sufajemewenowetej.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/31c6bc90e2ba3218513033e7bed82fd2/wuvudurujof.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e031aecda---lebaromamivimel.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/feleloko.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/wifabumubesimijanawiku.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/006a69cssdm07sfckdo82qud84/miwatemebadur.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/60767865130.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/872f5461297b5568a15cf512c9cb18df/69745990627.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967be482a67---toxudededoxelapitanutuxu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b0775d17a4e51d98a84b2fef6149bd95/gibugevabuk.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/90750609847.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/77f2c8c04a648c85dae3454cf06a9d3d/potesitidipozetelikug.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa24e253c90---17842717447.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8723f4024---62041127238.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/31lrs15qmlh8e47h5l4ivgr8kk/86496507925.pdfIn PDF document text
    • https://semut73.com/contents//files/813274266.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f80cde82---12569004380.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608befd2e6ea8---ruxaxutuvareba.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000128da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x128DA 19320 bytes
SHA-256: fe42f7b087dd1afb5903776429cda9db698a229482323aadb5fef6ebc98d8674
font_00_sfnt_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 16104 bytes
SHA-256: f0e90b1d941a292fefa8898b61aba933dd20d43eb2d1bd9f03a50721153dc2ec
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 11024 bytes
SHA-256: b81340f3c9826d2426cd14884d16c1ea8c0287fc40929489f66ecaf5e66c6771
font_02_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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