Malicious PDF — malware analysis report

Static analysis result for SHA-256 818711aecc65d210…

MALICIOUS

PDF

78.6 KB Created: 2021-09-28 13:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5fa4140088cf0d8483bb9c7527642e8 SHA-1: 0f4d76375c94c7284798a788e4091b996f3ba3dd SHA-256: 818711aecc65d2108047f659ae58654c0f2168eadbacad23120122503d042e7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://radio-clipa.ro/userfiles/file/96955764315.pdf In PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/lidedilulukowad.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/33019996692.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/54272272898.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/66587284893.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/sosezaxiwete.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/konupuloreburagurebidox.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/oop986jrft80fs4eja4bpqb3u0/93706387977.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/24686874879.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161423c190b1b8---93820913287.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/tigob.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/todojuwuma.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4491199026.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109120446493105.pdfIn PDF document text
    • http://consade.com/userfiles/file/7164447108.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/46715739839.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109101424467902.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/43323595767.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/chut53ne98agjv1t6hegqnf1ai/pifuvibotizajomezisopox.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/zemewukavokasizev.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/22778482053.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/72153673044.pdfIn PDF document text
    • https://sambelteri.com/contents/files/73466979418.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/ginolizuxekidudurunejedi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d338e0fcf---lovikojovekuse.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/wijafinurirajirewadevuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+can+i+retrieve+deleted+messages+from+my+phonePDF 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_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 11324 bytes
SHA-256: 16789dfe1451802079b55353d6b75b458fe65d66170a0d3a6ff97ef50d885a4a
font_01_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 19668 bytes
SHA-256: 8f6ac1ee3b64479ccd4c39e7d79c8ea87677c54a7dcc228bd10253dfeedf9ccc
font_02_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1