Malicious PDF — malware analysis report

Static analysis result for SHA-256 922130eabcb06d1f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 08:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0c1107817e96c209fb457d3a90cd061 SHA-1: f1b263ccd7b24539e60776408520f37179a5fc21 SHA-256: 922130eabcb06d1fa489b0c1c6392cddc53182b4993a025086806e8b7459881c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ajtoablakcentrum.com/_user/file/59374500461.pdf In PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/wobakotezakiw.pdfIn PDF document text
    • http://rsentco.com/upload/file/65625922733.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381353e02b3---59947285515.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135113ae32ae---jesinaxoteta.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/bomebodupasebojigevidi.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/zudimal.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/xunatusew.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/detabowunukugitopisa.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d21f12d89bbf5f2215aa5ff0042d1a4d/zevesilogolukepif.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/fegekedimasatovonetob.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971681a785---59863057480.pdfIn PDF document text
    • http://glassick.com/userfiles/file/pinuzefuzarox.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/dulizodijizax.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/69380985417.pdfIn PDF document text
    • http://cx-gl.hu/images/files/juvuxopiz.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ba824bcb---pumevifagunozomijuzen.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/povutujanujukitugesawi.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/riwusoxasitav.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/36375169551.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/10250731424.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/marurixizu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561d0dc2af---66715556973.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/wejepixufipinabawajatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=earn+robux+now+codesPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/norawavoxen.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/84371703603.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_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 17184 bytes
SHA-256: 4a10e8310eddaee7e6fad3eb51271c7f1bab26df3e743719712421d3f965cae1
font_01_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 10536 bytes
SHA-256: 045c3e4d28b1bfa5852e1dc040670afbf1379a6d87fa560ae50a09ce3f0b0bcd
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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