Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cb210c0fc57945…

MALICIOUS

PDF

82.0 KB Created: 2021-06-30 18:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fefc94f161e647ea050480d4e4cf02fc SHA-1: 5718cd0fca207cc9a52fca810ef41cc1c21afdcb SHA-256: d4cb210c0fc57945b75c0dff086b5bb551b5683b36fca7e715f1b79424b6093e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://omgmediatank.com/userfiles/files/gesalaxuwo.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fb859663fa152976cb304d0ba68b2c39/sagarofirovifub.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429197ec8a---23022516946.pdf
    • http://aps-mes.com/files/file/bepiwuwem.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/39dc2d9c3114e6d7354aec6cd5b21bf7/sedowel.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa682452a---61447177651.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abec9edcb5f---51849489913.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f8695423b---kusow.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16238312541241.pdf
    • https://palcev.ru/userfiles/file/patepi.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/16815511807.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab398979d58---40462888161.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a7760184---87110125629.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/018b0cc9ce31bc5bc64b1580af14d49c/23674472764.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/bejaxapazodixo.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2c385e2780690b12c87f6851cfabcdae/52449085556.pdf
    • http://musorcentrum.hu/files/article/file/27563952919.pdf
    • https://promise-land.com/upload/file/kinesos.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/553cf0a8996721dc7cff1568c2949a5a/logizopebojifupo.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65cf40af16---37452180317.pdf
    • https://evergreencans.com/userfiles/file/29114098033.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/1526297348.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=street+fighter+ii+the+world+warrior+snes+rom
    • http://irodori.kir.jp/files/file/bexutekino.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42f.bin
0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 16448 bytes
font_01_sfnt_off0000db04.bin
c4dfce351a48550764c1ec3ecfd9ae3fde3c1d3d53d567ed00c3344866db3ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 17952 bytes
font_02_sfnt_off000108b5.bin
a1d98e5ba45048e5bf2fee150592793ce24e86c3d18f5d5ddd52279cb402d144
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 10964 bytes
font_03_sfnt_off000121c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 16792 bytes