Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccde06f1baae8c1…

MALICIOUS

PDF

110.7 KB Created: 2021-07-21 16:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fca212df91a7194ac09efca7afbebf69 SHA-1: 06ad77b57d7deb2e1e0bcabfb1e312c5371c181d SHA-256: 8ccde06f1baae8c10065ef310c5b226e8cdc902254b9067f137abb0855ba38a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://terezmisszio.eu/files/file/tugovufimexazurobef.pdf In PDF document text
    • https://aashianarealty.com/file/mukonutabivi.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/60233266414.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/23448504575.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7e79ca3ec86b4282f281bad580447b68/7860215818.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c4e57a11---minagagemobevem.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe1b6ca2de---3226390412.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9fq0fkgbjrpt0gtm5telqb4hol/14643043784.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetulusoxoderabisijasi.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/kodudobafabexoxokolag.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/34ctlvgaaa1dasl22lde7j1h86/58733745882.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c64fba811da---99149996606.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/40584772119.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18699717a---xowajemutad.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/8r19u7dgmf6mi4gsmt1327esj6/21246081340.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44702898f3---pezixewimil.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/kibotiwezekurewawivef.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5800f9e883---16439389602.pdfIn PDF document text
    • http://asustainable.com/global/file/xupazifefovevexilil.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/kawufabijorosuguvixib.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/xotepiwopujubumop.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/barbvulcjan7vdti939nafhgk6/7836684642.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/fosojijuzepufu.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/xotifazejisoduxirasofip.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/57414389403.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d4af3e2f61564e7dc2ee7d7c0c3f65fe/fafipofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+babies+can+a+holland+lop+havePDF 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_off00014e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0C 10976 bytes
SHA-256: bb711cfa29b9b993b7be575ed39b4dc5fa183f512bc1bcdafbbaf8322227c076
font_01_sfnt_off0001671d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1671D 17224 bytes
SHA-256: 55977b1ecac133b9e5e5f1880bd26cd0bbcd64606a4664a690ea9927d9be0299
font_02_sfnt_off00019404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1