Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b5678256d0fb63…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 10:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 685ba1e79595f16bd128407897835198 SHA-1: f91edc24d4aab73227af6c8605d467e04e32db9a SHA-256: 19b5678256d0fb637e3ab1d94753aed09a1c9945c2cae53d9c9eee3bbc0de185
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to various PDF files hosted on compromised websites and disposable domains, suggesting it is used to distribute further malicious content or phish users. The presence of urgency language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://plafondchauffant.fr//img/user/file/wifegolavonifugomapeke.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rhiarrjailacimb4gde9lc29st/8551178601.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/r8jm2mpo9mrt3hvegmk01dvn26/rafuforozolozemipinan.pdf
    • http://roycraft.ca/userfiles/file/zopamu.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722c862e435---22807366627.pdf
    • https://orrizon.ru/images/file/32508858850.pdf
    • https://stopserv.ru/files/file/63226139188.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/be42418c07cfa6a0d1a98596af4001f9/92693211672.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bf4dfa554c6039ecc816556ceb76921e/97833763045.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aa507df1---48831324640.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609883498efd7---30075322562.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/nugc6fkpl98mqqmiqvem35e03f/20200855585.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/94e54f63e71e61e7d7e16034b093253d/gemebitazol.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37053dbf19---vogix.pdf
    • http://alnoorcity.com/userfiles/file/48103859671.pdf
    • http://softwarefactory.nl/images/file/noxixopebexun.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/777a9d609d7af832e3a878e0fd383302/gozisujarojixez.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091809ca3554---vumekula.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf2c15095d---79265848614.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1cc3c174b---75867280836.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3ce7e4011056c2af7cabd3729bfc8b4f/besuzokepix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=unprotected+sex+after+morning+after+pill
    • 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_off0000ebd8.bin
09a3226824470aa547442d0041f8669ef9156b688efde11a260783dcdfe59b9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 11072 bytes
font_01_sfnt_off0001056e.bin
9ddf245a45cc74e1ea1cfef37750afb9107ba9e5bec27a49859708ad28f6b55a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 17932 bytes
font_02_sfnt_off000134c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 16792 bytes