Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d7d31f089e3e2d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-23 00:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9cb182115e245b9ceaa0bb3b9830652 SHA-1: 962d6127eb46fd2a8936fd7023214db9dfece9c3 SHA-256: 69d7d31f089e3e2d88f8680bb6fb56be99acec9dba3be9c4c64df99ac3ab4483
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5990

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 http://rioairporttransfer.com/ckfinder/userfiles/files/fulus.pdf In PDF document text
    • http://mobydick-band.de/fckdata/file/dujefiwaluxibew.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_211210_634.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130882d1ac21---wunagizakuk.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132808dde704---tovixufiluzemena.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/43246861554.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908022531.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/newedesozakarubatelat.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/70741557987.pdfIn PDF document text
    • http://lex.tj/img/file/93553289119.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109160137403985.pdfIn PDF document text
    • http://levotst.com/uploads/files/fojobofipumex.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/26379321173.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/merinezojotawusezesuwuro.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f04f9e7b2c6ededb4bc5903892426d24/vedufotojeduzuvab.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/40438349009.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bab861422---soxagitopura.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/bupeviludazi.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kopisutejiwodutenofele.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/xudetadoxekowipepojuwam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c68769512---vagatilito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=optical+flow+slow+motion+androidPDF link annotation
    • 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_off0000bfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 18916 bytes
SHA-256: cc2651c25e0ea2342dd0f58899e27abd36dd21cd15dd0be3d3fc9b84be9f3d3b
font_01_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 10760 bytes
SHA-256: d8a9944d4bccc36fc8c4d6c7fe7b923c7ee1c8f7e80147da9103314dfde13fc5

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