Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc754b49788587d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 07:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 296b0241e4c4f9ca2d8b3e28a8483bf9 SHA-1: ef40b17dcd85a050536c2e254ce64cecd2c29328 SHA-256: 1cc754b49788587d2ecd9289a8cac19e66cbf9f2344b330bd9de7c9745d01aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=naive+bayes+machine+learning+pdf PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7b1fa666b---nakuwitilojisobejupe.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d25cf0462---ropekabedemasekosukoxew.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/nomubelivanuneginis.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3pno4201nm55fpnv1n9476pl0v/livebunozibajidisutoxaled.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/puderagabimumexuxonuvam.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/ditotebamegigu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a91a17bd06b30a5dc37fd6c4d1f97d45/wakuwogizopotevowibegabu.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/zofukudilotima.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/44459790248.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/v9qnnegd0drqsg4rb0691rjom0/padojotigesekaz.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/65173643504.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89d565a45---kutazejaxuzu.pdfIn PDF document text
    • http://tcihk.com/userfiles/89843146865.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f04cda1417---97528247316.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/96863919917.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/58508852791.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jldm7gi11qflps32dkj4m7unsn/48945336773.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/72596958440.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/21895624860.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160846f7f0c093---72016454436.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/36ee7bb0cf71204eace00228fb0d7cfa/jonotowoxevalud.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/l0jl7j7oqdm34lqodjgjcrjp73/suxogawisufivusudafin.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_off0000bff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 11148 bytes
SHA-256: 0160389102b6308e5dfb96783181ae83b1ad11500b76e0790d148524a04183a8
font_02_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 16908 bytes
SHA-256: d8db18d4c01df9ae0a2ed60f2976c8fe7acfcaf955f8e2b745d5da8ab35e7c42

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