Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f8795497bd7356…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 17:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b1311253dc52b6beff34257b9583b86 SHA-1: f9c5ae7bfd92fae35de11ca4557c83fe88363f58 SHA-256: 86f8795497bd73567adc51b36bd5b10f20c326132b65fd33f7929bdf7745ab4d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The ClamAV detection further confirms its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://parentini.it/userfiles/files/32367100963.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/43f2557b2ba490488e4bd105464587cf/gorujedeviximu.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e3a9dee06de595dc717295b556db0767/xonupifemugapu.pdf
    • https://blindnow.com/userfiles/file/pimop.pdf
    • http://maihome.hu/admin1/file/46089896006.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4812e7e3---58000899101.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/2033106732.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c9c3b143c08182276e0266a0e9d69ef8/kuponuvig.pdf
    • http://best-infosystems.com/userfiles/file/sirapemizuxuvixet.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k21ossj4nrs570gacflonh2pe0/wojorakewawolofutovuzurek.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/lufagagawibiwusojeko.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/rugikutisirilogas.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb2f3a7ff---jafokixikikir.pdf
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/sexojojoro.pdf
    • https://astek-telem.fr/userfiles/file/doniradekududujo.pdf
    • http://k3projekt.pl/uploads/userfiles/files/bopiriw.pdf
    • http://asianmosaicnyc.com/userfiles/file/31829913134.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9b0408bb---96227951425.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11c214f066---39549754215.pdf
    • https://semagro-msw.ru/pics/images/file/netulapobuvowenexit.pdf
    • http://www.europesolidaire.eu/userfiles/files/fefixazegafowawerimebigi.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c0341b93---tumuturofifisizipebikapil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=confiscated+meaning+in+telugu
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a5f709677307eed825d4299aaed8d10b/xafuduzini.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d305.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD305 18328 bytes
font_01_sfnt_off0000f0a7.bin
c1c626700b2e4762a1e4c6f09f6307dcde24d3d2e96d99be88b3f459f87582d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 10848 bytes
font_02_sfnt_off00010988.bin
94a881d40333514c7d1eb7b131fec2139e43d7188c8d2ab167c6762a5aa0dac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 23496 bytes
font_03_sfnt_off0001433e.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x1433E 3464 bytes
font_04_sfnt_off000150bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x150BD 16792 bytes