Malicious PDF — malware analysis report

Static analysis result for SHA-256 b448749dd8cec9d9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 11:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 191d26f356b3069d6a6536d05f884aac SHA-1: 8920196134a0682f51b6960bfc1fb17b72110eb5 SHA-256: b448749dd8cec9d9f1f513233a0f3d9920de31a7ca6a18e8a34678b163294434
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals multiple heuristics indicating the PDF is a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier clean score 0.2303

Heuristics 5

  • 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
  • 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=introduction+to+health+physics+pdf PDF link annotation
    • http://grandviewgroupresort.com/upload/files/megefitanuxesizu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ba749835---63483770292.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d65f6978fa3978bfa294c4b1b2ca350c/terofogeluxologetagalogit.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/79357059266.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/devir.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/27345897500.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/bonavipapetuz.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/62275265601.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210909040648.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210907_ABF7090742ABC5C8.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614700140d3e4---42125758271.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/makerixazawugi.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/giwumobexekaki.pdfIn PDF document text
    • http://sjanzee.nl/file/20584353521.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/tumebebukixi.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/vilexazebufeped.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pepejemas.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/97891924931.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc35d9869---83162831525.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/32812091653.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/45936598400.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/72278869458.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/80861766473.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/kamakag.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gafexidojimav.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210916/file/16318004189880.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 10880 bytes
SHA-256: f3b6d8d44d9e6138cc53598186687dc87ea7c1420972c0bb024337f2d4c09b5f

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