Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1df77931edb0ef…

MALICIOUS

PDF

79.7 KB Created: 2021-06-28 17:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6970dd94c5ceded9731ef62947c8a71c SHA-1: 8aca3c0ef77c4e28a0040cbda30d5fe368f9af8f SHA-256: 8b1df77931edb0ef83504f6a9add806be606ec48d1960d42cf54acf568081495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://bajajsports.com/userfiles/file/67919238332.pdf In PDF document text
    • http://kengosushionlineorder.com/uploads/files/40048002505.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/gexadafudumujidifusixibut.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a927a6aa42---73946721073.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/nebuxozemugaga.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26d0d1b295---53040359333.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f543bb15de7d942e8f5e095f7b8e8568/1096134913.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/vawekivob.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/wepadozefa.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/fuzorararo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1b2a945bab64616d7930fac3287878ea/zawuvetam.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608c172677f2e---36715068844.pdfIn PDF document text
    • http://dalaichau.com/files/53405182735.pdfIn PDF document text
    • https://dineflon.com//files/32552268410.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7147e2deb---kimajo.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/muribunupena.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28d49df76---83799936789.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9b32243857804e4d00ce3b78ae4b715e/zeripufinesob.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/37874245415.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/43825809917.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/xulanegurutogojuxadukew.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/fef970bec6225991a10f24e894be81f9/58390180159.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091b2461d6ac---bedomawo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/88ee1778060cd5095cb9800f05b58c7e/dutije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=new+day+thoughtsPDF 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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 10464 bytes
SHA-256: c53c9dba44e3a90b5d8e2f9957d9f45b1f136f9ef76500b624d31b493f05d213
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 16444 bytes
SHA-256: 632cb586fb4f3364011226142bc8ec0320afb643b25c60bc10119aa007f61175
font_02_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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