Malicious PDF — malware analysis report

Static analysis result for SHA-256 8762153e88e417a6…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 04:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0f604de7e213f6491db0d2c90611ae1 SHA-1: 0c89b56379239cf0d5390d9351b9df1bd8426502 SHA-256: 8762153e88e417a6a4fb2623a294a1ffb0d7d5c7363d02fffbb6b10341833d03
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb84a96472c---xisetereg.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd3c531c4---89693372565.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5e1d13cc4585cfddcf89a8155d10265b/sowegivevetenotos.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/lezevigiwizapotonigovikix.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/81418542140.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3258e23e---rabusamijipenebuzubojajop.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/311e29e3743ff60cbf5a58b6313510a5/29409268928.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/3448391631.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/8446718656.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7bbb6b3ce292772c0f66256b8bad9711/pufala.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/e86dfe722ec9503c1ecfef91697be98f/sexiwoxikamevozekage.pdfIn PDF document text
    • https://aildf.in/userfiles/file/35629374937.pdfIn PDF document text
    • http://elitvorota.ru/f/file/59145756554.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/xewuz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e30edd87f---timanivijivu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/90773817053.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4f52920c4daeb8807099b763f28503b1/gogoparel.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36e19c095---davesenatabesazud.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/mowixerakajokuw.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/78752319563.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mkh58gt0q2f3iv48i7jn3t0cjn/zufubenodipurawo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10e70e658---94816062907.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/pogodububajonab.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/velexexevom.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec17db36aa---wuwumiwuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dell+poweredge+r440+user+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 19760 bytes
SHA-256: 928b6d1fdeb53ff2891ff7d82525dcb5be7fb83091703b5466ab65e1c5c1ddd1
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 10932 bytes
SHA-256: 8fb628f3c1cdb6a846bc80a8acfeb0e8d6920fbb37d7e5738cf532a52f55d069
font_03_sfnt_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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