Malicious PDF — malware analysis report

Static analysis result for SHA-256 471bdf9000ad8eac…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 23:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1206f49b2c34e99e04330ef947d8294f SHA-1: 9077bdafcc7e5d13a7e347656b86173159d1ba6e SHA-256: 471bdf9000ad8eac2074a7f5a9e09bd3224f3c3091c4bc81ec7ab3dd4b4c2bbc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites hosting PDF files. This suggests the document is designed as a link farm to redirect users to potentially malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d0de8a50---13020786122.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mgpqirmmr8utqln2j7a51v0b5l/loloki.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/39d6451e7215297207724f13504c0202/91265174529.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d1fe7ec8f8fbfa8dde4d9c4564f3159d/xakolanubi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b213038aa81---19455008000.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/50034acd29c7cad883b864cba5484c11/sojalenumiji.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/toruk.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/78305243050.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/6888891915.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9j348csj3sclui62tuhnpl8d73/52774639245.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f5e5fd9a98703bc9ff78957352eb3a09/32336424927.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i86cibrag6ks3bghjoclr46l8o/27923244896.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c985baf0---62787379083.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/04bjckjmosm2npn0r3hub7m876/18368270216.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b411bb21---kizutirasatowesisigepa.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/12081574820.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/53908586013.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/riramamukulotogirezexeb.pdfIn PDF document text
    • http://aquatherm-graz.at/files/58204782014.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/qmtfc5bd5qnvs3guscrnk7do0u/23417667444.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb985200a0---7547674866.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/durofatuxarakolaj.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b65869eb8---nuzegizedefufobupolubanop.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/ramujaxijisulibafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=economic+order+quantity+example+problems+with+solutions+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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 19388 bytes
SHA-256: 642523ab225df60a7d2dae4697a0a79c614562e2203c9da069e0704c870a45d3
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 11556 bytes
SHA-256: 5d1ad1530e666ab321b211e995f548b03171d30e2d88c8cde0234e6a0867e017