Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02776fac3ddffb4…

MALICIOUS

PDF

60.9 KB Created: 2021-10-06 06:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1c0e798d190fdc43f2207a1973f9f444 SHA-1: e85cca55fc0b19535fdd3064f557733a848a8dec SHA-256: d02776fac3ddffb4c283fd5701b13a6a013b48092e65006168828dd8ff23726c
154 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and numerous extracted URLs point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba3334e8b1---80710074602.pdf In PDF document text
    • http://loadcell.vn/Images_upload/files/xetixagujujote.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/54274699116.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/9459895604.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/lapemuzuka.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1fa3ed813c9b34dc5db40e1d3ef3f95/48308158207.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/22696298150.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/64275831393.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/gapifowonidevu.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/33783958816.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/44328077098.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/bowurapalewobubeze.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090618163446.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/wutikitikovusemoruduw.pdfIn PDF document text
    • http://nemochem.cn/upload/files/fiwexap.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/d38u496bm18fv5l79pmt0vh57c/bupifetugatir.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/latogoragerobaf.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/xokurovimi.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/56800713321.pdfIn PDF document text
    • http://freewest.at/ruwogozepafafi.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/8742093556.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/38007397286.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/98287729561.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/luwoxebuleruzepizeravugop.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/sejuruza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=eve+from+descendantsPDF 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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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