Malicious PDF — malware analysis report

Static analysis result for SHA-256 db549fab58b5ec2a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 04:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66243cd404a40d26e0e94896b53c2a55 SHA-1: 48bac2e9ed25feda1687a85d1d19f83b8b6d3efa SHA-256: db549fab58b5ec2a015ae516942e37f5b2dbf94caefc8152c4b6905d90a958c9
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 functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection. No scripts were extracted from this sample, but the presence of many external links points towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=best+app+lock+in+the+world PDF link annotation
    • https://ceylanotel.com/firma/files/texuzeg.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/40540503523.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1ce7754b1a9ca60de5e9399cb01459ea/6992024733.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/94126713516.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/14641071905.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/74630581954.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/38453634979.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefizidimitebu.pdfIn PDF document text
    • http://0048.pl/48files/file/31680986508.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161324d0e3f87a---64986223087.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/toxopa.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/laxelidatitowitojenekesas.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/76454745719.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/nijogufebimemodefiva.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/rorafine.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/19075183554.pdfIn PDF document text
    • https://partnermind.cz/images/files/feduwawarukuveril.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/barifonironineme.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/73988388548.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f04d1d068---82732644453.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/fujafig.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/sulazejulufuxisagofuleker.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/83747989715.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/93a055a2bed8a20e9f88a67399101ae3/nezorerimujudato.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210916142118.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/lodanunibebeleromatisu.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/39763475358.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/luvulu.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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 16920 bytes
SHA-256: 9de2fb142c5405e87b9938bb81fb87336f254ff4ab276cd2bcfb2e59edd769ec
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 10844 bytes
SHA-256: a88e417a1c1c30a6b967f453d4696cdefc0c737e9ca29eecae27b92f721177f6

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