Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0e1c654e791148…

MALICIOUS

PDF

80.9 KB Created: 2021-07-20 06:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a6cdd37a6245aacfa4061129343f2aea SHA-1: 6c9afc6776f92c8b87386e3d05b9c32f13ddf02c SHA-256: fc0e1c654e7911486e0d08bffa4b6da968bece8ee117352417f8c1dc2c1fc97f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF or related content. The primary purpose seems to be redirecting users through these links, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://poorclarescork.ie/images/94791906011.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4965fa84b53c97ab0bf7f99c75b37d8a/dadupodupomamamowazexeja.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/gojumofifokirujip.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b1749e4dd1a9ae93ea651afa1e507d3c/fugogixa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0038b02b40---24392763488.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070a635e0c49---55042989949.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8dae68214cc3640faf633cfce201d3a5/nukozubexa.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee914f478---basawitulagoruwu.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/70515154677.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/45009209965.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c38392bb34---81122069883.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e026fe01fa1ca83b16744c349fe54412/93803259288.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3facc8e920cf490fb0cfca9088c965a7/xebijugixuporo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/ramitefokoj.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/t05ar16oab713mhv95jbhubc6h/kumetinezabukofe.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/3497aef0ce2c463ac59a511efeb83ff9/dudinujenilemegamuwoka.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c7d3e652000d67aadcfbe206fe78628a/76195115137.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/4ni6i5m88n4iaoa2v9ccst55e4/lifanarenin.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090c18c5268e---34509661433.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/11873283975.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/bexoz.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4496616c8---16237297857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=collin+county+tax+collectorPDF 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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16636 bytes
SHA-256: 1bd31ca2dc6383d981cd04f0bbf94c39d85cfa6938237f13f0cea3821faacc3e
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 10400 bytes
SHA-256: cf2c10c801cebf8f8c68f74b0cfd453e82f2538446e19e94f56763082f3bfb72
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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