Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcfe3028d91af16…

MALICIOUS

PDF

90.7 KB Created: 2021-05-31 00:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d54c54150280ebd4961e566f94cab18 SHA-1: a470e169d10e08ab84624048f492bd610ece92f9 SHA-256: 3bcfe3028d91af16960cdcf269b4c23b4c31581a358296f6d0075542ee4d6e2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e6f30e2fe83891139cee84eaee94e621/pazofapujuretekamoxave.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qnj7el1mtpajpl1cs5jq33rbng/gipedugu.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a80360723fe---68878885201.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086472e4bc30---bagewidemu.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/81133e9544870d1a5e49db7de6c93f87/xuvebimumoxegifopimilet.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e948192c2---xozis.pdf
    • http://volamtuyetthe.com/userfiles/file/56977569497.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/mizapeweginakiromotoxu.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9d24fcf75e67bccf898e6d49eed1e155/23024212853.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c776b74e---finoxuvevorolilazojo.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/9185a1a9ea38926cebe0d978044dace6/bibupejavaxizefapawe.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908babd79a3---butajobatadarowijuna.pdf
    • http://brukbet.com/user_images/file/sedanotulejixikidij.pdf
    • http://aeronautike.com/userfiles/file/nulirogawodigavibi.pdf
    • https://ka-base.no/images_content/file/fujowoxojiwifokawexomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wopet+automatic+pet+treat+dispenser
    • 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://scripts.sil.org/OFL
    • 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_off000111d6.bin
22faee6f2e7894711abea471aba63cc97af394e17ec84d4ac82ce707ba53a62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 5200 bytes
font_01_sfnt_off0001237b.bin
adc5ef579fe68237d2e561f4c00b8aab54180274918fae987c2984e611354b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 10756 bytes
font_02_sfnt_off0001486c.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1486C 16204 bytes

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