Malicious PDF — malware analysis report

Static analysis result for SHA-256 125188462fcde1fb…

MALICIOUS

PDF

74.5 KB Created: 2021-09-26 15:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c89c35b467d2b29f278cbe71623af33 SHA-1: ea185dc45023bb6af5b9dec3fadebd42fc38ee8e SHA-256: 125188462fcde1fbec9532580238df9eca91eb9c9c91190077fc474942f60416
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links are indicative of a phishing or credential harvesting attempt, or serving as a dropper for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d37ebea99---94359453871.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b348ded7ca---sadekasitobixufo.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/66455908769.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b4fdb08b8a9bfbbdc0ef6a7cfd8ab438/27077003464.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/lomozaburusibarod.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210925130712.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9150967733.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/31332287365.pdfIn PDF document text
    • http://surtek.biz/image/files/20150406_013149.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/74492862325.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-10/20210910104514308019.pdfIn PDF document text
    • http://m2m2design.com/userfiles/vitebopegizan.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05fa7e647---jupelajegalikivobazigezo.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/84365852345.pdfIn PDF document text
    • https://websbag.com/uploads/files/91160359784.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/nilave.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/54011735357.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5aa303139---41089711912.pdfIn PDF document text
    • https://stauber.lt/images/files/milimetek.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/subuzoxunidig.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/59325333635.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210925_288C54BC898A396E.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/3034167196.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210902033758_997295.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98ede36b7---ziveb.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0947f87---46243147153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=all+peely+skinsPDF 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_off0000be00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE00 9952 bytes
SHA-256: be89fda2ba6adf84267b260d73e89976ad8f8cfc3f4de1c2b6159e38b2d49614
font_01_sfnt_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 18740 bytes
SHA-256: 9dd9921dcb0b0cd2ab9ec907462bd949827d2973e0851e8f500a52be8648b43a

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