Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff2c00423fbe31d…

MALICIOUS

PDF

163.2 KB Created: 2021-06-29 22:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a5dccb32ac6a708521fbb4ab604ad257 SHA-1: 79eb382b5b7989a69b9fa48b4c3ff1cc302b7887 SHA-256: cff2c00423fbe31d8f94b45297bd40b6c18db256698a7950ee5ff504b9a00eaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9727

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://wastran.ru/uplcv?utm_term=4.2+practice+a+algebra+1+answers PDF link annotation
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b567253d9---36025835325.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/dabumovenidipokotonedaroj.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/wuwixarake.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da3e8660a48---56175093544.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/vuwel.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4c642541---govajoditejewe.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4l0nkrr81gpk7ubra83a84ugi7/45546174661.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896856c2fbd---54536148950.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/16840846880.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2235729cc---90098067531.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/67635723808.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/33280249648.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/24908982106.pdfIn PDF document text
    • https://theurbanthinktank.com/files/66851898571.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/95762244599.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/97128039479.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b8c7464d34932e433a757ae2cceaae57/14995067943.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/97268393247.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/2563409652.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f08e9192ac0b59ee482921f9b076ba61/xememi.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6917fb3164---jamadezosabivur.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/850b2115aed00a02e19066e77e5066a3/mebokixibebe.pdfIn PDF document text
    • http://atomleasing.ru/media/File/fewexuma.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/kobovebepujib.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d2c4a61d02dd39996d132db0f7d4a63b/37393053938.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
font_00_sfnt_off00020791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20791 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_01_sfnt_off00021d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D29 18256 bytes
SHA-256: c680b6b03749275f0769de552816984c85859f68d84ce363703cab28318a4dd5
font_02_sfnt_off00024d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D7C 10872 bytes
SHA-256: 931f4bce2949e2f4754f77919a82cb5fde1355b5622ec753b5ae461255af9193
font_03_sfnt_off000266b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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