Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5122ebba8b7cc16…

MALICIOUS

PDF

69.3 KB Created: 2021-09-21 08:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4d843dfad9b5576cdb4ba5659056ff9 SHA-1: 8eefcaf8d18c40af051dc3a461447d3883e9abf8 SHA-256: e5122ebba8b7cc16e2db0a03fc326e681d7b6edd668842026e08db5333b01cc7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5354

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://inwebjor.ru/uplcv?utm_term=2nas+android+flash+tools PDF link annotation
    • http://cp-1.ru/userfiles/files/pujapulapabupigofep.pdfIn PDF document text
    • http://zuche0551.com/upload/file/15994202001.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/740kvd71pu3errj3d100r6rju4/71128699106.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b2a2ed50---fumuwaguzavebof.pdfIn PDF document text
    • http://w-mill.jp/images/file/wiwexamovudivelexifigure.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/96236904202.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/buvidewu.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/fomupowalofozotuvalam.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/66898589023.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/girijujakunenulaj.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/33293405982.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/85017120426.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/voratenidudew.pdfIn PDF document text
    • http://partiaweb.com/upload/files/zuzuzokaxirudibaduxuwaju.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/76928261130.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/velewiv.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/wemilasuj.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/36815185887.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109180554311117.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5081864a98c237d8b05ef4e8b590eb64/ripojizuxu.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/novobevetusolidajij.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/1276110851.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/juberiwovarebide.pdfIn 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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 16352 bytes
SHA-256: 960e43f5404835fb9b4ea20811c4f05e5a797b8248977eb66785ebd713e3b4e5
font_02_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 10344 bytes
SHA-256: 4945eaffc6d95ffc456ffe59e7a2da6a8b4771d0f5770367649bc842e1943e4e

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