Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd06cdd463ec1b9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 02:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64f0249924c578223d2891f1a2414a05 SHA-1: 3cd048b65302d003e68630bb40b2fc12ce16ab31 SHA-256: cbd06cdd463ec1b992ae86f1b89ee87ff17ad8d79fc4b87f8970c2ba4284bb9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'LOLBin token sequence in document text' heuristic firing, along with ClamAV detecting it as a 'Pdf.Phishing.Trojan', strongly suggests malicious intent. While no scripts were explicitly extracted, the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3768

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://homestayhoian.thamtuddt.com/uploads/image/files/50866463617.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f997eb2e86---rosedanunikusuragotoku.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210917135829.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/10962863208.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/sakedetag.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/falefaxubiwotoxoji.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gures.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/16136468732.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ivqn2n5v3s1tf2gf47agrppbil/jopokijawijijalufowusowag.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/wupubopawepekex.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/73120983473.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/zusazibenadola.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e7299136d36449ec6a86f7a628c5c3b0/galekubadinuvi.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/74574239085.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-20/images/files/bibilezexuwer.pdfIn PDF document text
    • http://katachizu.com/img/news/files/zekixinukizasetozofiboba.pdfIn PDF document text
    • http://expresskaliski.info/file/274204189.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vg8osq5sm4soclf1v68e3ot2l2/miwatomabid.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/83214699084.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/61114398057.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135706293b12---74024923399.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xinizawomovuxinoni.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/tozoji.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/xawipi.pdfIn PDF document text
    • http://upservice.expertIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=yugioh+duel+links+hackPDF link annotation
    • 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_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 10628 bytes
SHA-256: 2f21694818912ea153f1dc867a038609c5b73a9bc6cafd5c45012a75b8c8dbe6
font_01_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 21188 bytes
SHA-256: e1225c25cb4ee3b67cc8f7a56d7f68df6ad11787c9765d5d29aca7bc4c9f9ecd

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