Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f85716770469e8…

MALICIOUS

PDF

64.0 KB Created: 2021-10-02 18:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3699527d1e68472cbcb206eea683a9ae SHA-1: a92a001dea93d41a125762db6b06a5824574506f SHA-256: d0f85716770469e8a6f91d960ea6ef78f57f7e0db6bc09289091ae2a39c70fe9
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification of this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6503

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://shuimotongyuan.com/userfiles/file/87552564253.pdf In PDF document text
    • http://alphanaturehk.com/userfiles/file/jigigufurebokej.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138b5f478f20---97069359907.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/riwakekulizop.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210916125021.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/27485841586.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/mirin.pdfIn PDF document text
    • http://labonscafe.com/userfiles/majul.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xekel.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab6f739ec---limopagurerosaselixigozen.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/60715242380.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/xozovaleferarikafozare.pdfIn PDF document text
    • https://faceless.me/userfiles/files/tevagaket.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/p9p9hu0af68i34s6cvvlrt4vj0/78243732442.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/40726113229.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fovezamavopelowokulid.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/16500976421.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/metetuxetiburawilusu.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/jarifonatimoselo.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/57201514788.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/weregatem.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/kibufebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=draw+objects+that+start+with+the+letter+aPDF 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_off0000af25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 10580 bytes
SHA-256: 5c315f7908fae28c74e4143d54a499802f12b970b0fe978fdeff7198aec6d32e
font_01_sfnt_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 14756 bytes
SHA-256: 053ac268588c97de0d66ca3f3971186872c9d935d23309cb056a4fdeb9df0f98
font_02_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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