Malicious PDF — malware analysis report

Static analysis result for SHA-256 950e8794cd437363…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 17:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be5c4f71299b125547f7f240fd4d1843 SHA-1: dc67198c0bbb0b696e4c12ea71aae3675b4d5fdd SHA-256: 950e8794cd437363fc836bbaf94392d47ee0434de71919533b53e08bc04ce811
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crewmak.ru/uplcv?utm_term=merge+multiple+pdf+files+on+mac PDF link annotation
    • http://popnmusic.fr/userfiles/file/21854303211.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/tegufuke.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/kefofuvu.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/jijokewa.pdfIn PDF document text
    • http://techbis.pl/files/file/71282835697.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/xemedanoxovipudowufo.pdfIn PDF document text
    • http://wohntraumgmbh.at/xolexokagaxodopezitirugan.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bb7bfae8---89252569775.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/11300514615.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be1b911a6f---62492402385.pdfIn PDF document text
    • http://wjcopy.com/upload/files/gigoma.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4m45988lsptla99gims5ul3234/39117487262.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070426ab1130---jorekafixajusaxawawovu.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/11824916274.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/16296416891.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/begabulufazosezoxojipe.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061818593846.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/xenejodasalipa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8e47f413df91e7b835b89d38e7209475/pemujafewuzoxinepitek.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/59636142706.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/30806994575.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098520de88ba---sorizukanavizegarogowi.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/tositaluwudilikosatelo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb311b13e---56181060894.pdfIn PDF document text
    • http://allasclub.com/campannas/file/2661186630.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd726b6e5---39646714896.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/masugo.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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 17432 bytes
SHA-256: a9090eec084298465d5d36b8b92ccd076ade2539295a60bb5801bc55b23f1850
font_01_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 11056 bytes
SHA-256: c569ad9f16afa1ef0402cc6c4fc9e5aae7946bd2ab47ed4a63eae8ed48dafd3a
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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