Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8d0705dfe66fa4…

MALICIOUS

PDF

99.4 KB Created: 2021-07-14 00:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14ac1917679b790b8627f1af2e5dbd9e SHA-1: a0599daf7c1426f5d38118947957a3bb145bc7f0 SHA-256: 0c8d0705dfe66fa4a36b6d96fb14992cea99244da910c7651220fe0d1b3b16cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://hotelamadeustorino.com/userfiles/files/35312988539.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4f05c5faee2998fa08a9aabe8a277c28/likix.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/609db9d159030191d5cd2cc8033b8f80/temisunofonetojojajalufa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d22b4743ef1---41003011049.pdfIn PDF document text
    • http://chamdure.com/DATA/files/tumomimamerikora.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2dec2539a7444c76d86213eae60654c0/85243828077.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/33255568299.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2bf2ae725135a76a80c97b7bf485584d/fuvepekuwotabivozixeden.pdfIn PDF document text
    • https://nicosiacaffe.it/file/98465463672.pdfIn PDF document text
    • https://avela.md/userfiles/file/38646137259.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/47871643256.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c30939e75b8---pozibinetagakorepoj.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2198f8f8---wewabag.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/81396065165.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/xurevizumi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b59abf91424---rorivibenemov.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/nuroxukabore.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c09bdab9507---96615054681.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xomugetixofasigilam.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8e3f149d76e8961d1fbc8f2d73175628/47183353847.pdfIn PDF document text
    • http://alakharia.com/public_html/userfiles/file/43016667268.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/745f3efdc2d24a50f0a6fbdfc73649f7/99235162769.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/86032914725.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/90207656583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rebt+abcde+model+examplePDF 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_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 17520 bytes
SHA-256: e75d6f2ee54d33006bda2f7131524667483fffa47e2f7fce504339680ac3cc29
font_01_sfnt_off000150b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B8 10500 bytes
SHA-256: 2e62398195f325043ca83ad4d8b5f900e98ff698b3570b676d96919dec3b3edd
font_02_sfnt_off00016876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1