Malicious PDF — malware analysis report

Static analysis result for SHA-256 74da84bc25b53b64…

MALICIOUS

PDF

99.5 KB Created: 2021-08-13 15:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd43763aff5cd3afb868a6dcced8be96 SHA-1: 9327ecf1620949a6a348e1d02ece82c3306a8e74 SHA-256: 74da84bc25b53b649d3f869996271ff17c1d0ad2e4b4594674684f417d65910f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. Heuristics suggest these links are part of a link farm on disposable hosting, and one URL specifically points to a compromised CMS upload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88fcc89a---bidilususozenawuluk.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a566eaac5a2---sunofebukipisudowi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160849f767dcf8---95985310770.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/fukomanisesotozomulam.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607571777b848---16597017914.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f058c2f243fc5b0f2d0d21c507af24ab/29520926872.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210719111951.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/tuxomowalutitu.pdfIn PDF document text
    • http://markone-tools.com/upload/files/luleson.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079977c20ad7---23151543013.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a71a94f59eaf20866300d0ed2a0e4509/85072227071.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1623917256.pdfIn PDF document text
    • http://sdds.be/userfiles/file/11644508492.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/zasukudutemamekizano.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad260061f---xuwunijela.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/24415955237.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a6d18822d---44967828111.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64c1175ef7---49921857673.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/rv8vsd9qi5b0tbrn286njljka1/20764737119.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c7tn7k153m6ig8qoei0fn0nvv4/73187691289.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/nugevono.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec80cd636c---99036581931.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/siferisarir.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/govekizuzudovofatovivij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ww+freestyle+zero+point+foods+printable+listPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ab50fc0e---431137724.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 10884 bytes
SHA-256: e526c2eada2a1e12df03eb74add1057cb23fc0b47e4afa303dcfe9bb80254a6c
font_01_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C99 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_03_sfnt_off000152bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BD 17060 bytes
SHA-256: 6ea88853738dd633fb08a67a95eaf21319cb96f8813b5e830dc4a42689e90a67

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