Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db684ee75010d3c…

MALICIOUS

PDF

88.2 KB Created: 2021-08-11 14:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f59d080f867ac1bdd17c9e49ba1cf5ca SHA-1: 9ae04ebf379795f808f4d24a77c0aba300ecf8dd SHA-256: 7db684ee75010d3cde3c4f2b6ad592e5f1b4199e77a940515b55096e0e0e018f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/3769485741.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5c60755547c8c861998acd1225278122/27717566290.pdfIn PDF document text
    • https://businesslife.com/content/file/vipateduxuwogelidak.pdfIn PDF document text
    • http://cke.hk/userfiles/96342739455.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/32639139635.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106b2ab29b9b---lopogexisulilemifamikupaz.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/81370703461.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/19446308573.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d6452fdf---nulamezelevovesoram.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/30037862865.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790ee5d4984---wuzaxujekila.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/vukiduxaderiletotuwejewo.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/vodox.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deac4e8b668---91933709598.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/15286435032.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b6e1f35654405c883b21bd900ce89dd0/53134984363.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b219286b76f---5911177039.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/764fe1322b6e7b223e729dd21cca3d68/72788754897.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/jozodisuvedajapa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2ju9hm24fj07jmiqmfclhu8epg/kibubagu.pdfIn PDF document text
    • http://groupkaishan.com/d/files/62144686723.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/zapomosevunikap.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a994b084848---41025020988.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/14d2c4bd839b7582d35255f27a433be8/kamed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=does+traumacare+cream+workPDF 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_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 17044 bytes
SHA-256: 270aeb4c610d05a54f7fb25fa439308bd58b38fa7885a924285d4abb66c7ea44
font_01_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 10428 bytes
SHA-256: 52ad34143c484819ca2a4de667e0fe1e2e5478eff75138e1812e88fda444f1a9
font_02_sfnt_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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