Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1004db396e04329…

MALICIOUS

PDF

80.3 KB Created: 2021-07-19 10:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f10ad5bc0644092cc166c53cf0db220 SHA-1: 1e4de8a691529218d3f273a26ba5986b1829b2db SHA-256: b1004db396e043290ed9882bae309bfe1f4fd2e73cc403f3ea30885f941e4589
124 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c785d1106ca---88880918910.pdf In PDF document text
    • http://hoangnamjsc.com/upload/files/78319177286.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/17647750346.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/30986376942.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/69523728800.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/79948219387.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/gawavopu.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/22376359625.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/voxawajuf.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b27ac88f46924aaaa84c4bbb381962a0/tovomufokifov.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7722336a799478741dac366c9e4d5560/21505049066.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ab876fcd---meligojiwef.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096bbc2cb4b0---73399896200.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/40656215354.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ba1a3304d206d18e08630d9086ad2ae0/65151955179.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/24266339429.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1caf6a8753f06c50739fa6dfef3be4f7/vojivo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kikuvomofov.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/muzemakopetedekotu.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/wajufarixogimalope.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/sofakavorenava.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/59990382271.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/19492240504.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083292cd492c---gaguzodinutifigiluvidaga.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/juwazusagisonunuxilelire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=create+avatar+from+photoPDF 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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 10308 bytes
SHA-256: a4e9bafe80d07aac15bf5a7406bc088566cd81ba906185848f92b3f6caa1cf0c
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 18540 bytes
SHA-256: 76ed851f620c2cb9edbfa9b882a26b767b99722acb4cb05184e3f6bae7c340c1

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