Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3efc48c0adc418…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 01:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ecff0e7ea47e59ab5056982b8bcc056 SHA-1: b2c4c181fc523ab762eb3699458769f2c9e816a6 SHA-256: cc3efc48c0adc4185016b99ef631766db450c2536f0fa47a91603a19cc56d6ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised or disposable hosting domains, likely to distribute further payloads or conduct phishing. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ctvvvtgefq2gui2or48t5ns9cl/6413909333.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1rm87iusn1bj0sdujlgnru3j7/datekoxaledogagunovi.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/nabelukupijivosumelu.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/59206902924.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/91560139064.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/pmvrdpuuq0bu3m7cv20ek4cb76/fajedum.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/15529381782.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/25606872206.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/nidi3jneljtj2baph4r8ifl5p5/faroxifowuso.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/boxezotutefumomeduri.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a495a05d83fbf17627287273e48fc1d3/32910105043.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfd926b8b---vulilajew.pdfIn PDF document text
    • https://miet.hu/kepek/vigesojamotonozax.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/telumoza.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c2c3be2e---64092447732.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3f1aee04abee330d15e26f9456b0d65b/32519827543.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/99323595268.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/giriwagidupexoko.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/bexejalujetusod.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/sasabigirexazowiwujelodu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce69b6005---99655462483.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608940b500b13---zibigejegiwofelidoluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=atomic+structure+quiz+worksheet+answersPDF 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_off0000c0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F7 16540 bytes
SHA-256: 0ccb3f668de80980c7bff1492506406513a50bda7ef1ec24e634f4bfaa3fdee0
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10912 bytes
SHA-256: d1da421ad70094b3ab7642dd2b2dd5ecba9ad683981e0cbf7a1c4a9875e73bda
font_02_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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