Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3712f0a8102801d…

MALICIOUS

PDF

83.6 KB Created: 2021-08-20 03:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21eaeb13e7df7d9ba6a773bdfaabb769 SHA-1: 9363473ef2f5ab35c30716ebd78796f9bfb77725 SHA-256: c3712f0a8102801d293d9617bbcc0f06dcd84a1eb9337b9e316ea03a26845f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. While no scripts were directly extracted, the PDF structure and URL distribution strongly imply an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

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://jjmcp.jp/userfiles/Image/file/20902047845.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/21eaaf2ddb9e04282b154c708ea9447e/71189241913.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/lemexopir.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/94814893407.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/74691199281.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/xidunakudejogote.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801a90da3cf---94909209150.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/xovivitub.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/60678241882.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c7582f361ba39a9ea2fe5e4f3636cba/15697560327.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/foralatibekexetaxido.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/1342648443.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bc4bff80dead3e7de82b268baac7c699/pizuxi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb2a8684a4---nolezoju.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/maseniriperex.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/xiroviwenim.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/87456717229.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0e2b022a6e862873a0515fe1307ff9c3/35767516451.pdfIn PDF document text
    • https://amblamy.ee/upload/file/famiteno.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/xerexubiw.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/dofaxepujimi.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/17814546204.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/73663765829.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/pomuxumelugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+often+can+you+feed+a+corn+snakePDF 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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 17552 bytes
SHA-256: c5f4c6c8405a957ca689f659a0d9030da161343dcdb654262314fd3fd1fa04f6
font_02_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 10712 bytes
SHA-256: 8ebd49b1fd30381388882def58d4f2163e70acea079e818699f2d9f5c25d5278

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