Malicious PDF — malware analysis report

Static analysis result for SHA-256 04de8663666d3448…

MALICIOUS

PDF

87.1 KB Created: 2021-08-06 03:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bad3ee7d33d8066265f708c521d44a5f SHA-1: b5b7e16e2e7115e674ca990046f2c38a82cb9019 SHA-256: 04de8663666d3448391a04b0ae1ef80166f115fb7abe5b260ab1142b2f5ee8f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where users are lured to click on links that ultimately lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d434e0755---59052210501.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160740f025ac18---zurorometorepedutiz.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/p78h9p6n004ufvfnb2tncjh333/toxekegifekiximito.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e93e3a46049---56648533582.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26a2a82483---jebegavafejuzozitigeletu.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/26304001419.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b77eb290094---kizafugimagixejarofuf.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69ff363e5d---gidosobelodav.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/votikevexulibaligan.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/1698246005.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/356002093.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/sirekejaxo.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/lepewidibitabapipogexoz.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/vunubivaniwuxaxinox.pdfIn PDF document text
    • http://altinay-law.com/images/file/girozefiduwonaxurixo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/firarijujujupazuseniroba.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/nasevuwoj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e9f796e0d---vafabakopoz.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55524e8e4e---60172505249.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/212196268.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b0bc6cfba933182b75e62894b03aa6b1/96091652953.pdfIn PDF document text
    • http://hifi-markt.net/kunden/kronhardt/ckfinder/userfiles/files/labevurinutojoper.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/tuwadutamumi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28669331c0---809467281.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/73m30586qpajqoo3j9611coflq/96793706750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=boards+and+beyond+step+2+promo+codePDF 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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 10964 bytes
SHA-256: 5f6b85ca17e9bb53d65ccf2294759bf69d3eaa135ae1bfe13bc23728124387d8
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 17548 bytes
SHA-256: dbea703983064f624c9f5c9c3ad709e5090eacecb26ef66c6d3206e647eb48a1
font_02_sfnt_off00013460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1