Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcf973ff89bc3dd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 23:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2099065b59af405c9bd0c037e2f45926 SHA-1: 76ab508c6877b7ab8f580ca756b1f383e058b79b SHA-256: 5bcf973ff89bc3ddeb2a2b210812503e20f3da1602dc69dd94e3ad2a4f21064b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` and `PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM` heuristics confirm this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://slovoveri.org/userfiles/fojopumavixabegokidibuzub.pdf In PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/93963267858.pdfIn PDF document text
    • http://pvvc.cz/files/97730504532.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/disefivuvudolujinavizaj.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/75695393183.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210913095254.pdfIn PDF document text
    • http://hocomesun.com/upload/52323320212.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133916c26996---kojodonovativiganevem.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/33896541014.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf6929f77---sexuxasanututuberuv.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/468f66bb498b8c78bb9f61666bcb8803/lemavajajo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/420ead4eb68a7b5262e0d0c7f00e114f/17438652687.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/mizomozazunezipikonovavi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6ddde0d83746450c767d989095eca342/pixezokilonare.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/pelepafelulawexa.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/4546078774.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/toxewebibubupumumid.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/24841274114.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/wosuferodur.pdfIn PDF document text
    • https://tsegypt.com/file/27156011512.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/59409320606.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/voxawidometonebuviradu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142996071f49---gadan.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/titonotenapaxidogub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=application+install%C3%A9e+mais+invisible+androidPDF 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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 19328 bytes
SHA-256: 23cad2b15e383f7195534aae7f1334cc035e534b9b882584fca8a764a6f42bd7
font_01_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 11016 bytes
SHA-256: 682ded1cdac0c0e9701d21b7213f4a67b69c8c7f2c56e97ff3fdc4dd04bdbfaa