Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce689731de808b1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 10:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 611fe77a2854a293c5c0210a4bcf3f61 SHA-1: 191ea6c3a3aa0b1213895107e0fe051d476329c4 SHA-256: 8ce689731de808b143712012185e93d9b973fb189982738e1b736afb7dd27185
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect the user to phishing or malware download pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cructi.ru/uplcv?utm_term=whats+the+word+answers+com PDF link annotation
    • https://coastalstudio.com/images/main/file/zegigejisanulolav.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210714083236.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f7d30f9bb9eea99456983a77278ff0b9/78114218321.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/35195473804.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/32674821798.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/foxoxiditobufinimopi.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/22448027752.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/pidijakuvezuregikuvi.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/14384306296.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/zujip.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/jifatupulo.pdfIn PDF document text
    • http://skomi.ru/img/files/file/56820712478.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/sebulogogefaga.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/forirusenaxedavi.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/madipizonibupawezupef.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8444f1872caf5d9316021647e94233cb/sudexefonifexadutimap.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b043e32b929---24626722936.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/zegimigibuxomibesig.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b304cd790f---84352226125.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/95974705886.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a1d26d431---kafunebomagupuvonaziwel.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q334uckq8epodlbnped5apsku3/19680854704.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_off0000b9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D1 16100 bytes
SHA-256: 11b038e38606335f5eff1dea3e1939c79f9bcb5a78406125bee0b86916f05cd9
font_01_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 10576 bytes
SHA-256: c472151433549b9c9b6b1d1446c83c7c800a06a61a000f04984af0058c11c5ac
font_02_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.