Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd4b09df32a8c15…

MALICIOUS

PDF

94.5 KB Created: 2021-09-01 07:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13cd5f991f9c4b8cc4c4eceed5f86b0a SHA-1: 04dc76678908de4a0669298ae4b5ed4dd0b9c433 SHA-256: ccd4b09df32a8c15a80858f2d49a5b77e7dbbe90ea602149c0fe856d58753e32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=convexity+in+options PDF link annotation
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cc14641c02f---17181382834.pdfIn PDF document text
    • https://tckontrola.hr/files/84941916111.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/fonarosivogekil.pdfIn PDF document text
    • http://sparkpro.lv/content/file/suvege.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f535cddca9487d2f9c128ab25176aa40/29271560259.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7916536030---72063062932.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/74787092573.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/rizowafamur.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/cuqp3a7kplna2rp41b3jql6foj/wimewogebez.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vabanuwosezogame.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/botusugixuzujulu.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/duxewo.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/fatuxojuta.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/watogagafofedanaxej.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608183d4dd121---zexodidejegifodamepi.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/sixelika.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/21836090936.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/37446552058.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf6ad30cc---jopopaselaminu.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/74508145734.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb85f8a7d5---88342973047.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/1838976694.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928de48485d---karabebobisinab.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082058240cc6---winekelepubativojupur.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_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 19524 bytes
SHA-256: 52305b125cb04aef4fe8fb74a159bc7ae358bb46bec6da877b513e8e2dfcf028
font_01_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 10248 bytes
SHA-256: 2e10065030d9fd4796a1af51bb31ca299a485a48c1c7c057f63a26ae94c62e72
font_02_sfnt_off0001531a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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