Malicious PDF — malware analysis report

Static analysis result for SHA-256 711806303cf6da23…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 21:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a39e0d4ec08eba6fe58d62c24e0db39c SHA-1: 636927099d5a04dd7044d8d56649425c245ce6f6 SHA-256: 711806303cf6da2343c4e585d692c0b7637179b5c84557274ad418a2c873505a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download a second-stage payload or redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oskarmak.com/userfiles/file/fakogikifagexaxiluva.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/t2lmbmcgqv95vdlmed3ld5m6d8/gixekifamotaku.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/5640882566.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/12949131143.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nobejevi.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/pibumowipif.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/wurupifer.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/wugifezagera.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f996297651---domokoladisan.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/nigigumeverigukobaronelo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46789c3b7---valuxuzub.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/senezegovonadetejaxoraf.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/10375923352.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vs7ivmpcgdofj6l15h7dsd8hj0/kokovimimogilet.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/hpkn6un38hp4ki14a0opshudtq/kapoferefobetuxujut.pdfIn PDF document text
    • https://actor-conseil.com/files/file/worubapejufokumu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7ghngfft5ppv2hno5p634jg0a4/38976948320.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ccbb3599f---vonifud.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/89607066026.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f20598c48---depekubadolununinada.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/luzasi.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/zejuwuwi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c5ql3l583jhh81b0r6dhnqkms6/tetavizifigopakamiloker.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/55701738259.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d123f557719a1dcb4dc673b35dfcd63e/27171115191.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/piberoribori.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/67500920262.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/oo4030d2fsi3npjvqvhgfht2ul/76582719631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mac+os+sierra+keyboard+shortcuts+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 18400 bytes
SHA-256: 493c4b3bb5373e25618443e1757de1ccac4c82a8bc961bf5132528b1ef0fab98
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 11004 bytes
SHA-256: 44a72c631d0e8f5fd2a29b02083b818787214b29b0521bab246bb5a8a41e1ecd

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