Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72c5ef065727b2a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 07:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86b4b7094048424f29361fde0ce9abb8 SHA-1: 9745336f98f1147389ab12c1e0cd2a64885f4a9a SHA-256: f72c5ef065727b2a1eb0ad73f220033c9d45d2cd97d385a0efae04bc92b65ae3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://dspec-car.com/js/upload/files/72359145066.pdf In PDF document text
    • https://shen-su.eu/gfx/userfiles/files/mefunavamewajufuxepavo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8a65b6531---vimigowaw.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/80681159202.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16114623ee66d1---12799947366.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e5bc45cf50aa8ad7450c60e2bf5db775/19944109628.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c6cbadd9096de874f90c2e3094f2764b/52687500432.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/530b8380073bbd1459176fd2b0051454/49878854541.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6jhrp64hrkkcbl96nim2l2ne2s/momuropetavasesufuxizi.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/mukevubitekagopafuse.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/88af1e48ee6643a09ded4a538ef79628/63174328034.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/kezejobanolubilaguduneded.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/12616868075.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/login.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/357004a331f2057f3ff323e9253e9d71/lafilatozebovijuvodakudo.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/womej.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/povifiroroba.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/vapofitug.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8888af24d---48178404061.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/80977344613.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/27304469392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ice+rajkot+jilla+book+pdf+downloadPDF 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_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 17328 bytes
SHA-256: 882e4f5520bebd6503bbc9f1ca889b9696280f3dc53769f5413d4dac07a4b8bb
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 10844 bytes
SHA-256: 3bd6a50adac1fa88034f5d8f9b5d8a742679206457ccb5ddbe753e8dcd3f1fd9
font_02_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1