Malicious PDF — malware analysis report

Static analysis result for SHA-256 479eed273250d423…

MALICIOUS

PDF

89.0 KB Created: 2021-08-24 22:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ca6dce826ca88fd09c5872eb78c44f0 SHA-1: 553e2b3dba28c67c070a0fea7385568a406e15cc SHA-256: 479eed273250d423059eb8fa9184c3b1dd8a40626bf04f3fd9e9cd1e6a8a6282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This 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 compromised or hosted on disposable infrastructure, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of embedded URLs indicate an attempt to direct users away from the document itself, likely for phishing or to facilitate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://arqing.es/ckfinder/userfiles/files/rikewolozezogirowewe.pdf In PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/piwajed.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077946aaeeca---56592225819.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/69u0f8v5s1afts4lsgk9o73uo1/lopezujutexolavelu.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/waxipefapel.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac60e78a112---fuxavo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e70facc80---wamogesafoveguganafido.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/mizamolewojijosano.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aacd83be7d---wurazekorodozeb.pdfIn PDF document text
    • http://carszana.com/image/upload/File/mirataniferusepanajovuk.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/33797776091.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/378a8giv5l90e87faertufq2n3/17470970120.pdfIn PDF document text
    • https://peterdegendt.be/file/64649115890.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lagutatosopadaziriziso.pdfIn PDF document text
    • http://stromzeleny.cz/file/33970389681.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/pumeb.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/47108037520.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/pupodepikisadipowolawoxef.pdfIn PDF document text
    • https://andrejc.si/files/file/duzavozijufozil.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/79998459315.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1th686jnldm03hh3uslapuk1pc/kuxudozotimafi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tulisadisi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cb86adf4---67732028425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=citing+a+book+in+turabianPDF 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_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 17392 bytes
SHA-256: 97cc935807ffed066f321a3fedcf7bb560d1dec4ccfe34ab46f789132d1febc4
font_01_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 10300 bytes
SHA-256: 01e8dbd9fab56ff20755682e82989dd3f09a06f3067a9e310fb0c29f9fb119c1

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