Malicious PDF — malware analysis report

Static analysis result for SHA-256 82faf60830847b12…

MALICIOUS

PDF

71.4 KB Created: 2021-10-04 03:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d509ea5150de003c463257871bdb5c19 SHA-1: 6d17a673fbb2bb567bf4c4bbcd3691382a6ee4ae SHA-256: 82faf60830847b12821d39e98ba3d2824197b4e12a0c22017a34af12088faa7b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely to deliver further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://champagne-marc-chauvet.com/images/files/16760936420.pdf In PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/taminenujipusite.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/raduwatuvokamalo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/mifodoximal.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/lalodutijokisovujepopelu.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/12778248274.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161534abf020ce---23923299989.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614752607f2fa---tavosele.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9d355bc1f437ad877d44d205119b24b8/worifozeliruwa.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/menunezakopemezinibagogab.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/ridobatogeserero.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/natozozadizilozeroganuk.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/99700136005.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/84263197921.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/tekewino.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/67686691848.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/vasufimaragakisuwif.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/84200664865.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/fatiresu.pdfIn PDF document text
    • https://kaparatt.com/images/File/farobufu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65a9ddfca---tubupanolosigipufuzux.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/jukajedelajovujobekuxir.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/24180203009.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161574f96d09db---xewidelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lobster+bisque+with+coconut+milkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB485 16376 bytes
SHA-256: 550d1b60d22074335f81ffa22d4d5207f3b9d5066d7e1ba707a5fbbbaa7f3806
font_01_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10852 bytes
SHA-256: e2ce729f7c5ab19b4daffe9177e5370d5aa7702ef21b416a6a0c1b4dbf62f3d9
font_02_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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