Malicious PDF — malware analysis report

Static analysis result for SHA-256 7826649c74614bb6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-15 13:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86a32436543192135db909dd7ad8c948 SHA-1: 421f275de517bee2b21f02ffda39bd72a617a6ec SHA-256: 7826649c74614bb6484d9c9cca599626fe7de6c0d38752a2e40eaed291422b86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8c1fd1b49c5634e9cfc0bce93b005600/9139001846.pdf In PDF document text
    • https://associazionemusicaviva.it/uploads/file/90742603960.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/83967598663.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/piboz.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/wefidadumerexanitegixata.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/lekenufoxepafixonorub.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/towobax.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadb86587a---7584679587.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/12641784011.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/mitemowixasuvuwawib.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/67650980049.pdfIn PDF document text
    • https://fratellifurloni.it/file/65266773383.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nelokelitipawiv.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/25373578483.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/lupotivilinalew.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf371245c---jamisoguwol.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0759fadf5ad8de0c12dab2e4fb89ce8b/59222245225.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091218062598.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/5436089400.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/31171811402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gta+4+iso+file+for+ppssppPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 18324 bytes
SHA-256: 4ec6c641c118510ac1e2ba79c22a8ef0d96c62c1421cb7a6e8b09433483c9dbf
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10364 bytes
SHA-256: 410963abcf1c8e886c335f219b7202c1faf303fe4733a059ba2f6fa66ad4f433
font_02_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 17736 bytes
SHA-256: 754bf7de01d10063036621b5b741f0d4f12f440871bfd1612b5d3f356acfe191
font_03_sfnt_off00013bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1