Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69d3ca43fa1422f…

MALICIOUS

PDF

126.8 KB Created: 2021-06-26 15:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 685941cfceb1a1b5542024898a4b04e4 SHA-1: 2dcea965aeb99c5d1d6913efec1e936a6577aecd SHA-256: a69d3ca43fa1422fec7d5041eb425dcdb96c3ad2b1557633b80e00f9b968f49b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF contains a link farm hosted on compromised WordPress sites, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous links to potentially compromised upload directories suggests the document is designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9635

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d423397541---8291907108.pdf In PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jinirerevozapibawukefe.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2e058845---ruroxalojasa.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vtqv63s71j45blkvhr0r85r8qf/18125938313.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160923f7f9c74e---16083084590.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070d93762620---wisumabakeg.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/retasulisofa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a171d036cbc---39214515444.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a4c17036---42198805314.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1361b33f---jedarotepajegagonezixefun.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/75738186164.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/339d462da0884e8ab12c749625a40540/nobakunobimuluvifumi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160833e15a8257---88204093447.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/br7aml20ajfgf43lom8k05frg7/39887401338.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/27052894872.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e5a377ba451b35707e24fde8c2d68c4/tovafo.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/tepekizedurawafodex.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/nulafepobaviroredamu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e562cffc0---68832215933.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/nimizufapezep.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c8102922---24815378892.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/tilumorawewodariruwu.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/defudivofuze.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/15986594049.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/mubipazexawalejufeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=corruption+meaning+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00016765.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16765 28220 bytes
SHA-256: ab1c557b1477acb3c9655b838000bc4404e657129b41fb4ad6e628e2b978a62c
font_00_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 31508 bytes
SHA-256: a9f5cf8a8d3762dba29e7e592d707713296813d26771be602ec5c9c5de7c242b
font_02_sfnt_off00019cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B514 10760 bytes
SHA-256: a10e93e71c41ccf34e239bb6892061d47d5fb5ce9a9d2604a338562b0efea6d0
font_04_sfnt_off0001cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD8C 9076 bytes
SHA-256: ce7b89a600aaa83255a0e2b4a607e935139e298b2393a3a2408c71bbae17dac9

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