Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ee503a1b50e425…

MALICIOUS

PDF

77.5 KB Created: 2021-07-06 02:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9617991a49b6faccfc1613f1672c9580 SHA-1: d143738ff5141c3b0837a13f3d91b9e8d7b28ab3 SHA-256: 35ee503a1b50e425ac8ccb8682f03c3da86468d9409bc991f1a1292b70738cbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities or contains malicious content. It functions as a link farm, directing users to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute further malware or phishing content. The presence of multiple external URIs and link farm heuristics strongly points to a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://cecprint.com/images/file/bixazatikageposapipen.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073717293a33---77551511067.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab7749492---85884504671.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/bm79vgclm5tcvihj8bjmh602s9/34502447660.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cd4e7e0aa---gageledukegoli.pdfIn PDF document text
    • http://polletnv.be/uploads/files/petuvuxekekalobekewenu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/223d5016ab998f59e0948b6ec995957c/vamas.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/nipur.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7d704772f3c5e072ef8ef595eb71d3ee/30347999402.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5mn56555hno5u50mlbnap72c25/93596322174.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160998882a4255---viwitafo.pdfIn PDF document text
    • http://runo34.ru/attachments/file/21080540945.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/kagamutijegibokibowikirud.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/79449050938.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bb277fa2---36482871583.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a6edb7e6e4e4aea879f0c10e7b7b16d2/fezabunasowovadited.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/tebjrspqqbc19ior96rmgsucqv/rogejewakozavisuli.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/vojuli.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/22576395417.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/64515201488.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607587ec3ec77---rapejotiputezosonuj.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b82a7e8d02aa324ff477d64d8400ce08/nuliwebato.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/78d3e7973208f8d6423fd34fc2ee45fd/titego.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a6466d750add82d7ddf755853c139139/sategipitupikavoluka.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/buliwupejuwowazigatono.pdfIn PDF document text
    • http://centrons.com/uploaded/file/73541877960cd931aae9a1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=practical+cookery+9th+edition+pdfPDF 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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 17424 bytes
SHA-256: 3bd0edfbe0d663d879188b57c725ef1009389687e4d5d82a819ab4ae4d91653c
font_02_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 10924 bytes
SHA-256: 6f29c03235fffee079166459ab927e4415701c3bcf187540baae093d2d49c7a4

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