Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dcb0834cb1b74a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 21:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26c9dfa3bbfc752ba6f44531e2fd8ba1 SHA-1: a94652445cf19e9100574cd7a9779246ac77fc1d SHA-256: 57dcb0834cb1b74a82c038d475de3f5646547a354fcb52ea8e6297b4eb205ffc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript and a link farm pointing to numerous external PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://hoaisonland.vn/upload/files/35777710033.pdf In PDF document text
    • http://asude.istanbul/ck_images/files/72502027275.pdfIn PDF document text
    • http://sun-tes.ru/files/file/tasanazosegaxodajesofeg.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/gupasagimotovowupiv.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/romaxesiliv.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vegusaviseposarupez.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2dd5b6e6a---giwumudiz.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/malum.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/xisotopepuboxugexeg.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//21240502206.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afec995f286---jetunefegivovef.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/gafajavujukodo.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/17205740627.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/jawutabuzaxopunikuwu.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/03530058f671cd27c7601ad11d1462b8/88638651829.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/79630822797.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202165132227885.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/45774408677.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/48775266018.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6e00d7253cb66a03b9519cddcd897083/71072600955.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/gojiveriza.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d79a85e096a---73138425070.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mujugiwikitibid.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/65699477347.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7fd97b377---girodoweduxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=exercises+to+do+after+c+sectionPDF 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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 10508 bytes
SHA-256: 39f7b485121ab41f3e83005c523932e296cfeba41e4d7e3ee509f3e812dfd916
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 17500 bytes
SHA-256: 290ad2eb89008bc27aaa7eb7e0beb608f953c637f68b6130a4eea9c2b32ae162
font_02_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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