Malicious PDF — malware analysis report

Static analysis result for SHA-256 73dbac8db3c493ce…

MALICIOUS

PDF

98.3 KB Created: 2021-08-14 21:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 018f37e4f93f499991e7f8765ab6f384 SHA-1: e18dfefe39efc7c0f01e0ba45f411cc71ea91a00 SHA-256: 73dbac8db3c493cea276faf5e41ae9265ed25331e8099f5dd96d51fc63ea9d90
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6nk2v6mc68shadfbqf0mal6c03/jituwetiwojis.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/kuxajir.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/62db7a11ca98371b8eafbb24996fb447/26814565008.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/71021220405.pdfIn PDF document text
    • http://guowangcable.com/d/files/62837579055.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/20218642314.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/16432253771.pdfIn PDF document text
    • https://starbox.fr/img/files/wimaroxezelibejakapu.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/80442190657.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/51024859600.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/detanor.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/fugabiraxek.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2277915f---wojeturunuru.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7817bc9580---85245792407.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/fomivel.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ekmh8vium4tpn42t31rd5ic3j2/wepagarefifejojatoj.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fc4c791b13d8b58f272c3fe58b0ac467/6744209799.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13bc88ffb---julutogilozegemibima.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/68421882043.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/zifatixa.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/43529450518.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e06fde8461657f156ec69179ad3484b2/diruxizozuno.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/24026290a1fc09fc4dfc8cbe953601d6/68589941778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=characteristics+of+neoclassical+age+in+english+literaturePDF 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_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 17648 bytes
SHA-256: 5be10e520f1b412ae3d4f3ecaec35c754295c3625dcc459b6c31996a6651ca9c
font_01_sfnt_off00014891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14891 10744 bytes
SHA-256: 34a16d8b9f21e3d7b2d305a50d42b322bc1a71f57b91bc84b6018e0012e3ea33
font_02_sfnt_off0001614b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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