Malicious PDF — malware analysis report

Static analysis result for SHA-256 0657451db1e12568…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 22:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7d1ca9496ef6be712dab4aedecc828c SHA-1: 1c778f3852e214b86237c59dde5bfd8c530dec49 SHA-256: 0657451db1e125685760cfad8204e9eb615fad27b0931a8cf6438dd13b1e8227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or SEO poisoning attack. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://daugiavanthienphuoc.com/media/ftp/file/wonevugenave.pdf
    • http://autowagon.it/userfiles/files/nuwizetitagafofenil.pdf
    • http://misterholidaysanprisco.it/userfiles/files/fovuta.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099043096308---91552971808.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720eb978002---zozovomarinewutoxanun.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6f4755b591c3b0f05674e74810f90d7b/27580957126.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c527041a0---64833002734.pdf
    • https://noticky.net/akce/fotky/file/69856598371.pdf
    • http://ankurgroups.com/userfiles/file/sezidamerorulajoza.pdf
    • http://albino-pitti.com/pub_img/file/63072789705.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908243b34be---jefukan.pdf
    • http://faceconnects.com/ci/userfiles/files/xivesaxaxonunazid.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758ed0983be---34318650131.pdf
    • http://desushibar.com/userfiles/file/98903123765.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/34869677159.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328142607b---75659366130.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/17a2322f5761051cd5b258d77feb7224/kunoginogepunawaki.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20791581497.pdf
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/tunod.pdf
    • http://acecaalcoy.com/userfiles/file/vavos.pdf
    • https://genegurumiraclehealer.com/userfiles/file/82804808423.pdf
    • http://gorod-r.com/userfiles/file/30152710665.pdf
    • http://planet-for-events.de/userfiles/file/bemumodijasif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=black+artists+in+art+history
    • 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_off0000ea65.bin
9a197a1930b084301bebee499364f8ddf706ea53457cd20e30663de70ab880bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 18364 bytes
font_01_sfnt_off00011ae5.bin
786b40c3314de97c10691c954c989280cd9c54692ab55abba01d51886c7d2e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 10452 bytes
font_02_sfnt_off000132a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 16792 bytes