Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d10e25b2da84f8a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 21:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08adbe1a23bf4641220175571ecc2c23 SHA-1: 86cff724a7b7c9bfea4ecb4bd716f95b76cb85dd SHA-256: 0d10e25b2da84f8af2032570c4f6db1a3de860575f74f5b446d7e4ab6215ef9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and compromised CMS upload links indicates an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://autoteam.in/ckfinder/userfiles/files/24485675265.pdf In PDF document text
    • http://suchanekstomatolog.pl/files/file/wananuruxizepigowunutawo.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/58815895630.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/duzokavakatonage.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071221da8953---pusaruwijufez.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7f522bf199f3f61a6b5333ab2d29f6a0/jamosebuwu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951960e40cd---kegomisawudifafozupug.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c612b0376b3---sazaxuvagilifubusarun.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/reguz.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/tovekukobi.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/lipuvajuxadeviziwo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843204ae2cf---xenalagirezapufejo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b684b7f833740a6be9fb47c310f0cdf2/6768571313.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/l0pldel8tfljro578nc4jklsmq/22491383618.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/momawekapazuwuzanuzomufi.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1630349261.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/68355792438.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/litisoriwumatu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a24082201---jofovar.pdfIn PDF document text
    • http://unseretochter.com/images/file/52219415218.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9fc22b39020a3fbeff5e99da68ef48e8/53738639965.pdfIn PDF document text
    • http://mlead.net/images/e/file/fefolepikimak.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0f2fcbfafe9b33c53b7e8ef5151ebd10/wezurakajafoma.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784d502dce4---96144422187.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/podagumanizeborixafoxesis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=assembly+language+tutorial+for+beginner+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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 18584 bytes
SHA-256: a7525c3e46462ecd58e2a78798be16ec023a861d01f18022205db04d0511070a
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 11176 bytes
SHA-256: b33751b834d437ca3c6861d77aab1e7a0a0e210abe3b7ca28036c500211909f9

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