Malicious PDF — malware analysis report

Static analysis result for SHA-256 473ea42b03925202…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 13:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 249d53b29abb0ced174988cfd2dc5dba SHA-1: d1534dc8261b5fe19255cea7dd7fbe02cc0c3303 SHA-256: 473ea42b03925202d6d8f00b8c19abd6c9b2a2ce3ddec012d3890b26a22b0ddf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous domains, many of which appear to be compromised or disposable. The presence of external URIs and link farm characteristics suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8616

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://coretry.ru/uplcv?utm_term=v1v+lol+unblocked PDF link annotation
    • http://ville-dammarie.com/ckfinder/userfiles/files/16318247273.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/dd5cbd151688ef33b0fbfee5f7ab71eb/mikadup.pdfIn PDF document text
    • http://placc.info/up_image/17575309721.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/zojoresinisukekokosa.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/33193920524.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/88351109690.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/2462979300.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/59956467001.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210914191725.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/fidagunimeg.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd88724c2e---59202847089.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/120ddad5cf114dd321ec6240e10e94eb/31996090209.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/xuzepifisisatusizipiwet.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/magupupubat.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/73934940692.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/kuwipigipexivosib.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4c09be60563e592f3dec84e8b2dafde5/pufugozakibikexuxuwak.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090522463126.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m256apcuif1l3ittd3uivpg582/52395517903.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/89507119596.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/zavule.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/nepolozajo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135163047724---53005667433.pdfIn PDF document text
    • 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_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 10164 bytes
SHA-256: 666f96664f5b589d219016c5fab98a6cf31c1891cd40402c5c0face8e5921122
font_02_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 18040 bytes
SHA-256: 30ca20c702f12db592b906a9254410391ca3f99c37ed04e9fed88abddf58b307

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