Malicious PDF — malware analysis report

Static analysis result for SHA-256 832bffda75c3ca6a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 10:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b3e4feab5c328ec11468041e399a59b SHA-1: 59aa8a854ac6b91242ae2e77baab279ae3bde239 SHA-256: 832bffda75c3ca6afaec0af1648e7167c9be9bbec4a99cf24e456c47073ae4ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm points towards an attack pattern designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e511b382df1---gifera.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2a5dcdc462c47d610813889d4896166f/85024236318.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0859cfd34ad744b0cd7806f32676348a/83934991478.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/77874790070.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/37030156089.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160829398c1de6---88870318949.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tibusizumumiwop.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/tevelekimuwipis.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/83195954141.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/wokid.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3389bfbfa---rawonubikogedodevos.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/pirisagob.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/vevudaxapifotajuwit.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d06138b67---67455751328.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/5811451462.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/pugesoz.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f844e91b---lubopivefabub.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/fnhnju7tpevobrefpvvvvt5782/48968508602.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1622831844garijiwuvopuk.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c958d9ba82cfc9493109ea8d027eb603/71103575829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hijri+calendar+2017+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_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 18784 bytes
SHA-256: 1e8c06070d63ce9243911bfc2f28da1faa2e58698cc6b63bdfa8417137c30d8f
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 10692 bytes
SHA-256: fb5642c89d54fde0d4bdcd9b9bd45793dfe47388c57079a7b0b9d879fc0a51ad