Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e25b5063779532f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 08:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5cb18d008ac25c549a1535ee2c039eb3 SHA-1: 85eb06a19e2d3221523715fa271fb083e71d4add SHA-256: 7e25b5063779532f0a454a13a014f2b106a4d6f2c78c927fef37741b67033b04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure and URL analysis indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/708857a05f57a0abbedd6f3cf54e8a45/42369712773.pdf In PDF document text
    • https://wodepcb.cn/uploadfiles/files/35251750367.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bemimusewibiveluferodar.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a6c8243fdb83e8b27ef5e336de57f2e4/5149228658.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cbb598a992f98efaf898b0acc3959b6/62668540658.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/bbd9d57285f23502422c8fb0b1fc403a/zujokekotobewizibas.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/letasaf.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/862sc9j0ogts5a3h7j5a0lr2nd/93449670136.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/9956321155.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bed29e7a9---nepeganunutuvu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2bccb49f---fasakomobowozumotezeku.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607108716e4ae---basigunixudotu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608df2072bbfc---pifutibozir.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/wefobepugizakojifip.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/853ba726a1f61dca52594e46a8660def/87070816821.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/mofenalep.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/82580622135.pdfIn PDF document text
    • http://siembra.me/uploads/files/wuxilasosexax.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec3618ed7---4823263423.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/88809768476.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091e7aa73663---zituzezed.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b8aa4b7cf028158d10d930279eebd5e1/94752996716.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/234142310609ee2245f393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nsfw+chat+discordPDF 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_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 17440 bytes
SHA-256: a0f070e021192d595a1f9f977833077e3f8885dac5c8b5d28a4949b5d64da930
font_02_sfnt_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 10356 bytes
SHA-256: cb110963dcdacaab828928c0916e9b571992d6808f2439f0906d483d75ab349d