Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c96889da5a22713…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 02:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c03053368f395fd01427fe32e1d33821 SHA-1: cb89e3f21c8f4c5f078cfae7c272076e21b6f282 SHA-256: 0c96889da5a22713e1b95b778f5c23486b04dd232a2da972e1e8a4a3750298d6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9613

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://sibstroiexp.ru/userfiles/file/75158524947.pdf In PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/41947308050.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607accb6eb3ff---16090667144.pdfIn PDF document text
    • https://506hlapeta.com/files/file/bugotinekusozevebemag.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062300250779907.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/popazefaxegatimow.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/68862956102.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/96196210819.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160856d843b0fb---xakeragudidumulagodeve.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/84967294369.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee4730e60---terexuba.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096044de3fee---71043719752.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/zopudof.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/bobagoxebujijegujeru.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qkqj739rdj563kjhq5in3p4hfo/11953044511.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/kutinazexu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609042f79183e---26538291150.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/31880278043.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/v31g55ko5av7v1mnbo8vrsoj53/raduvisodime.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c378db53a---kobasu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/32779932284.pdfIn PDF document text
    • http://446888.top/userfiles/file/66410334808.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/rawalezuxezaxubapo.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mkpllue3ragcm486j57hunfu16/xivetijavodatalema.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/63a330317c1f874d0f78275f243ad46a/68643308405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ice+breaking+introduce+yourselfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 18188 bytes
SHA-256: fd1972681c4e8a0adebf8e3502d12559c6be54648ebeadffced376f9f371ea53
font_02_sfnt_off00013bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDE 11048 bytes
SHA-256: 2f982eb25e927f0780114e99e1b16626451d49e482dffcb34b5818b240a8383f

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