Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e177084df07bf6…

MALICIOUS

PDF

86.0 KB Created: 2021-08-02 03:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 102b6868b5d11b02ae356e54b1630f29 SHA-1: 3b4dc31ad85c7e7239a8d883721e14155fe22ad1 SHA-256: a6e177084df07bf63d4984cc3b67e42ee864b9490c060bfdfe933b7ff0811ae5
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the nature of the link farm indicate a high likelihood of this document being used as part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5921

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 http://assessmentinsight.com/ckfinder/userfiles/files/30319243929.pdf In PDF document text
    • http://pnmanagementsolutions.in/uploads/zerojiwewilonekirita.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/mubazi.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7df8b7302---mezadokonekefujufifo.pdfIn PDF document text
    • https://stopserv.ru/files/file/baludu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6788o3qlmvpct91mefshoaikj6/nodibero.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/o32ni2mgjhqatsg5cafe6etcec/62369555513.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2ce6551630ea5da2f593701a880b86ce/3691631333.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5327fa91---87965456139.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/uclmib4atnkvg6vu4mo1r5pnpi/79294133650.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843ac9ad50---palujego.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/04beafbcd43c643688e37a6d996b21ba/786778923.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0712db8f17832d7adb7931907ca1004f/rujijakaxudarunew.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd8f8033d---81162006243.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d078db75e5e---82637176134.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/lofikigamabeg.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b82bd1e8d330ad9679b759a1031c6485/wutawofogifutit.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090a553d1d15---gutefipaborid.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/1577411441.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/naxajon.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdef6f387c---35809063859.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/pezagulinujivon.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/93271427775.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/90775672815.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c920b1d3685---37027025582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pl+sql+full+tutorial+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 10500 bytes
SHA-256: 421af10c46a1e1dcb2b64d4b07e78a643895c9dac603fb84415af56493a27a1d
font_01_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 18304 bytes
SHA-256: 34e7b6081c3b5178519c82fd6e0efbbd214662aa85beabba81aa214b4077bf66