Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a0300c68905b9c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 16:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d54391af9e72dafdd79d147b6d5243a2 SHA-1: b87c83e2d60cd0d132c6f49b5d0b0a0cf67ae492 SHA-256: 21a0300c68905b9c75acc6390690f77104f0fd90600e5f0339bc2c602f390962
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple compromised CMS upload links and disposable hosting reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kuppersbusch-center.ru/uploads/files/9007330266.pdf In PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/21021664030.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3c887e64---63749745598.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4a6e7a186671464d68f7aab66590509d/wemurat.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/fca96c196b7987ac54a78db4999ae28c/buvek.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4580d98c65b089dc86dba0c932f6722c/46956614225.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/029c437eeeaadf24301abbf0a28f29f2/43865948790.pdfIn PDF document text
    • http://glttek.com/userfiles/file/xavivilarumoxilopexu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/76763954776.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/82573143145.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/320ebca10b2db2657520e36d314ff6c1/tefaf.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7c2741a4---59979493278.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/7596057149.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa242e0a5f---82914970981.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3cd8c7f8---biruxefarirowerudupa.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/zarulokirovunakedate.pdfIn PDF document text
    • http://paliukenas.lt/i/File/51654839510.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/radapenuma.pdfIn PDF document text
    • http://rozgarnetwork.com/ckfinder/userfiles/files/75229626086.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7880a709c---70641721493.pdfIn PDF document text
    • http://labsshop.com/d/files/donuzumed.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/69249821989.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/bagajumorajano.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/60731711904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rcub+ba+5th+sem+syllabus+2018+pdfPDF 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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 21236 bytes
SHA-256: c21d8e30dcd897dbbb1f37b082f3ba6fd8dce4eb4701d84c940502bb1c6c45d5
font_01_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 11504 bytes
SHA-256: e4c240ed72e551feb30615ba3a035626b3592ee5823b30586cc39dbdf2e92cc4
font_02_sfnt_off00012e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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