Malicious PDF — malware analysis report

Static analysis result for SHA-256 3098f146b3d7fdcd…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 01:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b8d1ca5024b1fd2298bd70c590b77e7 SHA-1: 4968cd438f95ddd68d2dbd7ef9c507819f467aed SHA-256: 3098f146b3d7fdcde636d9a41b41f2681e9095c598b17b7d904cfd677ed2b9ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to execute malicious code or redirect users. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://asi-filter.pl/files/file/15697321147.pdf In PDF document text
    • http://babamoleskine.com/files/file/62573930448.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/3a46d6a89c981ecb610930dff38d04b9/tavanav.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/65512377549.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/nizidepi.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/41245973995.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc12e53112---52519231467.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/53c03bf915e7b95a992690766b85f234/45888224425.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/28316661387.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/803fd568268e191344aa8f0c086ea5b7/pumumuratizavob.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b456a478---bepupizozatisojumobomumi.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/gozanenukokoji.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cfdbdfb27---79393443079.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/zukajemisuxaganeb.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/4130468145.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/5955664400.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/50890136527.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/81043511782.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/54963623312.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077085a362e8---wevujidujifuxezupizesuk.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/mulololar.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/webirupobinopitavake.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/35105630328.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/76921940141.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/51930bb762dbc9584c06c361825e8d58/38586412254.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99278916447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+pdf+download+bengali+novelsPDF 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_off0000ba8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8D 10844 bytes
SHA-256: d7de0bf5467bf16ea5560a9a61556db7adcfb52fa2a74a46fc7861dd15a29ed0
font_01_sfnt_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 18408 bytes
SHA-256: ac3d79ad2786baeea40ededac9a5c4bb4a24f9400b6889f6097844611a4a6666
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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