Malicious PDF — malware analysis report

Static analysis result for SHA-256 725612e13a39e076…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 21:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 396c2fd654a7ad702d01e263e1e25bc0 SHA-1: b7e5394d48cdc036458e1b13e22d382eadff092b SHA-256: 725612e13a39e076db92a5973eaebba8bca193ea8bf1f6d56276823d552699fa
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to multiple compromised or disposable hosting sites, some of which host other PDF files. The primary purpose appears to be directing users to download potentially harmful content from these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6920

Heuristics 5

  • 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
  • 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://rh4-h1tapi-turbo.com/contents/files/64152921158.pdf In PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/vimudimepulobika.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/19372011202.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/o40ukcve1lvo72ukohl2vd4l2m/galodoxikesuzixarabek.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/59928177766.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/45161572264.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/zarozijaluxojefa.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/libupakedosigewudota.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/nigezo.pdfIn PDF document text
    • https://nyig.com/files/file/demobuge.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/18370824850.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/13000834912.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146969ed8cad---mexezo.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/dawamepefilixalal.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134877951e3a---65716428815.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4c2b8bff3ad4c05ae1dfeb1623b31a0d/nixuxivesive.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327cdf66cbb---ligoxomevop.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/wodokezafufajipakumagezu.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109110306215195.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/38235847223.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/89120400398.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/favibov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=keyboard+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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