Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e6b7cda68d9686…

MALICIOUS

PDF

95.1 KB Created: 2021-07-31 18:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f363e80fb2a25d92ea3b28adc61d367b SHA-1: f5ce33292639fdc7cfd2173e84b97999b9080cf0 SHA-256: b7e6b7cda68d968678c5fe3a191fc6a4f38907f5d87f34f9877ec77b4d1df748
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=how+to+create+a+business+budget+spreadsheet PDF link annotation
    • http://master-sign.ru/ckfinder/userfiles/files/7527140661.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/sesegakujenijexalelaxi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9715b8d73---jubeminuxigagunotuwiziz.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/91186075160.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dbc55514---wezonuro.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/wetalasisusisapurawuvo.pdfIn PDF document text
    • https://rosycaffe.com/file/8472008888.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/95254391338.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nirebi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c288030cff---gakojavimosiz.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/26537254221.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052205084910.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b45361b3---puxupexesu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a63a79ced---tufenuw.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210611163057692706711.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/nodageba.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084afb9582ab---dozot.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/455164733.pdfIn PDF document text
    • http://samtle.net/ckupload/files/rogazu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8v5h94h637qu0fd94t7lfcufpt/zonojup.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/rikazejozub.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/32723755867.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/guxezapel.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/gepukuziloxezodif.pdfIn PDF document text
    • 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_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 11064 bytes
SHA-256: 94912d20f2fad1af639ebe8c10d6f8436e5e0cc7ce2bd4feb7f7ef0b7b47dad4
font_02_sfnt_off00013db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 18072 bytes
SHA-256: dc5f3df1e938684881e06128aff5ff7cfabe2b395423829eb6dba26380d09667

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