Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6ca0f05c0aea2d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 08:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19081d50febf85ca68fcaf7c8a4ecb33 SHA-1: 6059c7f18a5c9228ff2d5811574d94f81d6e6d22 SHA-256: ca6ca0f05c0aea2d7fe1fea2f4a3067fe8ba7bb14ba418e3389aa5c72a3fd384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in malicious PDFs to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=sap+transaction+codes+for+production+planning+pdf PDF link annotation
    • https://bikeid.net/ckfinder/userfiles/files/sazaxovuvanop.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/bubajafotomime.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/62208174549.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/68386431112.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/301fc5a0260e4c097ea02e18fd6e7e6e/17519972712.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b45d47b4dd94d11905159090e6f5c0bd/51648523858.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/61be0bcc6f7e7bbb3a8f04bede774e59/sapuxobixizotutabobije.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/19364255176.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/67169448756.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/67542856959.pdfIn PDF document text
    • https://pecsikult.hu/files/file/wizul.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/90175949069.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/70097444495.pdfIn PDF document text
    • http://co-mit.com/uploads/files/69130543819.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66794769307.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38c71e086---tarazazive.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/28196007910.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210629044406.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/80f358378099b8346618bf0ad829cfa6/ladabipinoloviw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e777a8e9c56---90561773422.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc14a85020f---sufiruxalipikaxupelu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598ed8713d---29919824692.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96090d033---tetewupugezux.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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 10972 bytes
SHA-256: 59e5b8a809a6567f20ee180b9d432c688e5eda75781f8860691ccdf9de810774
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16372 bytes
SHA-256: fc8ab47848de5ece1b933f9b33dbde36fa04a3f65e7ce61861df6858f3cdbd0f
font_02_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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