Malicious PDF — malware analysis report

Static analysis result for SHA-256 414c91a9cfcc8cbb…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 23:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ad41cf35b646a5a773396cf7be15e26 SHA-1: 241b0b565b3813c28cb4ec2dd3c5c4ab997edcd7 SHA-256: 414c91a9cfcc8cbbfb7626ec5f8720bf8bc7198949deb4c9097d10c0219c1fa3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/29c022226470a47de897c923a533949c/rorubaxotupajasiwa.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fee3c19ac9f1e4ca04801bfd7f5de14/tijapavovef.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tbml5igba1in680io5kvvae0j6/jexotera.pdf
    • http://santeh.md/img/files/rijibaxador.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e86e2288e---85032183690.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e17d430ca---81157652985.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a7b3c5fca252c6304c7d404591c76e66/xiwakibobab.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077435a73606---5640629065.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c75419ba7dc192ee9e4e768ce0f99c75/bulusujuwinivosipagama.pdf
    • http://cdkkck.com/uploadfile/file/20210615153805.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2c2ae7f756a9570b521196f4992a05ec/61278627190.pdf
    • http://lagostena.it/userfiles/files/xikesolivefasijigu.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d0431caa---sitonadixuwetidi.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/31f2ce5143208bed9ae110528692d941/60011950326.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/towotulevilunibuzol.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/57c563b7f85b200b62552a9fa02ead0e/dimofokogideg.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d6621db77ef3a766caac66aa2dc24c7e/66653129294.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab89387c---foxorimagovudajipota.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/15700362452.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c23e42848---44341322430.pdf
    • https://anukulagrotech.com/userfiles/file/jinup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+grow+money+plant+in+bottle
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9660b3102a35d9f25308b28a99a55996/lobenilos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ab.bin
877901acb496fb4d3d41043f97e23292bf6a611f4fbfb3a2ab7631e5ec8d4aa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 17332 bytes
font_01_sfnt_off000125f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 16792 bytes
font_02_sfnt_off00013e0c.bin
2b94c3485546bbb238a5ee0d49d6f6f77849c410ea5333b8ce2e90fed9f35ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 10756 bytes