Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c0d89f5924a323…

MALICIOUS

PDF

80.4 KB Created: 2021-05-08 09:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0325cc90ec7dffefbc12732a909f77e SHA-1: d1028fab9336d1806c1658d844111b5e11404c51 SHA-256: d5c0d89f5924a323668333efb2777a4aa9174493edc6dc2fb99728d9f5853940
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8211

Heuristics 5

  • 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
  • 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://ancoraeducacion.com/images/widosunuvugezolodo.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e6740a37e11602261a8871ff6edc6926/65467548662.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/iu9rif1kk84vakd20a2s8hlpo0/30820605377.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ebc3194360954860dbeb4feffe7f04b5/86334571499.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac4f364c0---8433352300.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8bae036ddf694cf98da5638b04fed752/19079443546.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4f707bb4---tamabopulif.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608226fdf366c---89855392391.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d8c1ff9901f1ea8092ed10c31ebc66cf/rabagiminarusuveja.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/ff669c473e00e616a2da4f61fa756520/63128375814.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a12355f52---vafine.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947295184b5---zoxufagapavunurasapamux.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gr572bbgjrpg65ibpru5nqo7ic/94792392829.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4534d870aa5e1b86376257871b29c130/zonanixovuzaxizev.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d727932dd13db8fa61f7ec9e7abe977f/89971800852.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b322c24be4356e4b7e6bc8ddc11509ac/nuvufaxifapinifiko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=english+grammar+adverbs+exercises+with+answers+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011056.bin
e299f2a13913a559c10a4148935fd17e512cd1f1332081c8896cc74facf2889d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 5884 bytes

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