Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cee2066f179c5e…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 20:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 547eba71cca091e989a258816382d5e2 SHA-1: eb84cbfea0aa9c4e46d75d56850d436c1a3c7bdd SHA-256: 49cee2066f179c5ebc5713dbfcb1927191263417e6caf0a8568a10c445a79102
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. It also features a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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 http://okmarin.ru/userfiles/file/74388710443.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/945d1d69a46899dfd166536092f0785d/wosibubeti.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d46a6264---89407766073.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tawenufofulerepofixoku.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/vibadujanag.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lewawabubajusol.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/563ujeis9b0pec9tfq45nf1ne2/80906049173.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p95uohcks88nqn04rcnitt8ua4/68110864309.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210720_A7EFE27206A27427.pdfIn PDF document text
    • https://ovalpolycoats.com/media/13741917742.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/54e529545884bcdbf83769cebc2e327e/keborudubobago.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/21683563cb15b3bd63c6daef11dfe7c1/78832704037.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/wemofafu.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/54396574905.pdfIn PDF document text
    • https://phnews.ro/files/file/xuxodawaruzewafuw.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/96291276952.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/94724717473.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c37def0101---1692556997.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/volikatoreki.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/90111d02236232d459d6e6dd7b558afa/tarolaxajagesajubuzolojez.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/8120130749.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3b84e4f91a0ba43bbf40e3cecbf4188f/96601378732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pages+to+pdf+converter+online+macPDF 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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 11028 bytes
SHA-256: 09017bc6386c8717c270fed3b0d618c5ca2add0d1e095b6b14daba8fad76c922
font_02_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 18864 bytes
SHA-256: d1a6dee7a470f72baa263d699b4bb73a972e67fdd82774561acc75b1b4c03f39

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