Malicious PDF — malware analysis report

Static analysis result for SHA-256 39150a2788c3bb83…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 18:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b647b067c015cc857f06f4a7653348fe SHA-1: 79f6d8876c84bff2a6d17d10b440a3fb5393b109 SHA-256: 39150a2788c3bb83ccf5b757bdc468b4d68cac2436051590afea13f6783f4b4e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to external websites, some of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The malformed stream length heuristic indicates potential exploit code within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/39346266261.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-16/20210816151332507731.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mh6qqarigvrvq8n997t9gp9nd0/gidapaputap.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mh5pleha5j5idmfk0079vhj67p/77716572450.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/tudim.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f326ef06f1---17083647216.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/28e44da70a760e950a77532f20966f84/kopudoxoxubevetavileto.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210723_0DFAE099CD3D6037.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fc497629470de756067b8f3abe0850e/fazedotagabixunobumub.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/zigerajugafosujipuwebub.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/48754313259.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/5752724991.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef794763b1---96296526782.pdfIn PDF document text
    • https://atl-50.com/files/file/40134082731.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/37666281947.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-27/20210527165209129297.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/xorigatetesu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c500a0b21e6---botuxelofewo.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/21102774264.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cc301cbf3---55269760032.pdfIn PDF document text
    • http://palami.by/images/file/debevijigixatatepipimazex.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108190007088136.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/k086prd2r75109cfr4kfu3e9av/fomoduzomebijawarup.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/vepudunotigurorowudefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=queen+guitar+chord+songbook+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_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 19328 bytes
SHA-256: a5a82bc701506b0cea4a9fc38fb93c165da0b0f36a88d82d4b2672436b7378f5
font_01_sfnt_off0001281d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14034 11244 bytes
SHA-256: 3819cc2bcd8aa939113c3e96495c564b4842b9efe32bb9ebe8935a8bbb61740e

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