Malicious PDF — malware analysis report

Static analysis result for SHA-256 695e807a83976347…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 16:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82bbb210e2f955c26ccc584b56c4c2b1 SHA-1: 8d31ba7848a2bdc89bf54ac5623a805dda2f9b6a SHA-256: 695e807a839763476f0d48a570015b9367aecb739e157480e53c15ec46314650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=zimmer+implant+catalog+pdf PDF link annotation
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/449c018258e608ed7b4b6ab45d65c3ea/limurozikivonazolite.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/86dlhrs7908huqvhnh3j0njtau/29442497749.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/198244e228a5bba70436f1e47fd84377/97830417972.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2226d9238ce252d31da8f438e063c590/sajarutilawuse.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371e8b951e---60546403315.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083efb86d23d---fedizilutuwapitenizanidug.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/gudigagezili.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/80248122049.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/6158754653.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf817deaf4---9769299122.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/juxiraxigore.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/tijadutosokiso.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bb762e688ad8065fb61508746a45d884/26916589142.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/wamekadi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba308d697f---guvumobim.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/lubasasoro.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/28814384696.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/57744822343.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/xulifowagurejus.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/87329599974.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/16a18d5c184cc8d717d7c0a300eaf87d/zupir.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/26047266138fea8db34978dde5e21d1a/difuvizepulota.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354eef165b3---88620978473.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_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 10756 bytes
SHA-256: 56164ded60d0c90c90646d86170cde5fc3e8a2f4591c7867e541ba8984651303
font_02_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 18156 bytes
SHA-256: 89a645be3eb07d53e7f9443730c7dbd8ed7a825ece0f402d795047df612c2e7a

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