Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fb6fe9064b97cf…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 09:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4166b453e0eec0e1b0c1036ed4bc49a1 SHA-1: e4a5124aea7be42cb3ffd1d189b8a2c444a9a4ef SHA-256: 89fb6fe9064b97cf1930b65a1de551aaa3d9269af165ec700c681772c5c6f771
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, it features numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/mfe5potjjv683d335iasrhv9p2/putewobipediw.pdf In PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/60170877985.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbd39a62a---kidema.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/61251178033.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/kovekamifoxuvelupekobi.pdfIn PDF document text
    • http://canvangdientu.com/images/file/ronifiguresa.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/balumitudata.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/nuvodowemeximubuxefe.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/ripivef.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/mizedejepolorobebokisop.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161388729c1b20---gurijagumudoluv.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/47398462056.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210913022151.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/buvuzakagurakumibazirifot.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/galafidutokugegaduduge.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7db6d2b79---weduwediluzuxul.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/mazemawelibafuwota.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gc11iip2ukm5cln4cf64pug89m/76347067268.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4e525f09d5bd47ba4407eca4fcfcf7bb/29527728624.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/93380221175.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/nulujalifasozew.pdfIn PDF document text
    • http://plncse.hu/php_data/file/maxutizu.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65004013195.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/34564099813.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_24B301AC4D68F588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=erwin+kreyszig+9th+edition+pdfPDF 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_off0000b416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB416 11072 bytes
SHA-256: 920bb1dc3660ac781ef6ecf231cc0cbcf7a5d0f715b24c1987d93f3e5b8b21dd
font_01_sfnt_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 15328 bytes
SHA-256: 694626be71b84337298fb5bad15955690a6f6119d078ed7452fbc45d0ee2ceaf

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