Malicious PDF — malware analysis report

Static analysis result for SHA-256 b215c9db02ec3890…

MALICIOUS

PDF

78.2 KB Created: 2021-10-09 13:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a348c269a0c777f434b3a00f91597c17 SHA-1: 2bb0c323b616b2ea26a61204dd3d400137256bfa SHA-256: b215c9db02ec389011caacddc41c6ef6c8bcc966b2f92bbe998c0b7852a4f448
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to facilitate the download of further malware. The embedded URLs, such as the one pointing to a compromised WordPress upload, are key indicators of this malicious distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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 http://caratow.nl/userfiles/file/95379739282.pdf In PDF document text
    • http://bsbcarpet.com/userfiles/file/39496376455.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/bawiketar.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/85900603791.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/1099869815.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614933ad3e89c---wimirasoduxe.pdfIn PDF document text
    • http://hkwwta.org/userfiles/boburozegugabil.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b637edee---17719986008.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20211009072417.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/98813095884.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a2c8d4a38---javuxosoneviruxavewawij.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20211009_181512_6620.pdfIn PDF document text
    • http://asvpp.fr/pdf/puwanewukiso.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/jinifalivuvekevuvowelitog.pdfIn PDF document text
    • https://longhoang.vn/upload/files/powisexijopizefapi.pdfIn PDF document text
    • http://vaynhe.com/upload/files/puvotugiwixalu.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/84072570755.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/xojotakalem.pdfIn PDF document text
    • http://ridendo.cz/files/file/xojabolawazipepobumox.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/95042216897.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/36941648677.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/figesojenurug.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/resujexetibenaf.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/jukok.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/58437804536.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wazuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dr+driving+game+mod+apk+downloadPDF 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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 17104 bytes
SHA-256: b7f239fbe09794914e7a010caf6fd255095eb6c9ac45a2586290f3a9b1d30a03
font_02_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 10712 bytes
SHA-256: 05fc7eab6e31f8e65147b6c794f858c20c0af98bde1cfd4d8d6f79970e725e86

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