Malicious PDF — malware analysis report

Static analysis result for SHA-256 c729ddfbcc8abc01…

MALICIOUS

PDF

86.4 KB Created: 2021-07-15 11:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aa218dfc89c068a5c064ed63f3e6acd5 SHA-1: 3f6536056d697c0908742ec8455b8df357d49301 SHA-256: c729ddfbcc8abc014af589781b541ad7ef5f71e77d2b31139c9ab65bffcc29b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing sites. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.escon.it/wp-content/plugins/super-forms/uploads/php/files/23798e008e49274568fe25d1a49628c8/mijelolaxibalom.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec47b412c2---badabaribun.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/87458673751.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/juvajugu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c360dbf3cb---63782952918.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/91734764506.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/vnkbj280bj114b2gsrbrlsu803/puxagu.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jetirilad.pdfIn PDF document text
    • http://vinmexindia.com/uploads/nudefodatosozegatadamep.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/xajutakesatajigoj.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/403ffda6cacea3b10dc24f225f5e9798/letigonijozulisopipopito.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1447f69fcacb4a11ef6c35d5e168c195/14056842113.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e60163986---gedabekuxunamoxubiw.pdfIn PDF document text
    • https://songhong.info/userfiles/file/83785080103.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b42b9b1d---gonojotebosize.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3c3847e5---loken.pdfIn PDF document text
    • https://fotovipvercelli.it/file/67781562020.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/60296799339.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/99647216561.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160788aa3b6ebe---55811794976.pdfIn PDF document text
    • http://vizcsap.hu/files/file/redirajonojeserenozij.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b555af9bf1b---neravedupepesume.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521101217559642.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/f8c23b104a0grd21cdna6og4cj/wazolizojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rockwell+extra+bold+fontPDF 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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 17684 bytes
SHA-256: 67585c32c9f2dbd2ff4f4d13fa30db1fc72b1ed97dc46111f05887269539a9bd
font_01_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CA 10672 bytes
SHA-256: 6494f109e41cd4ca9ca752a3e075a12f57e4d305ba3f2f535713a06cae0a32b6