Malicious PDF — malware analysis report

Static analysis result for SHA-256 9787a5cf254f88fa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 17:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ccf652262e7067481aa74643a8f7149 SHA-1: 511a4802ecec797aede4d16bcca91d8012174916 SHA-256: 9787a5cf254f88fa19495d649a2734ce16a58be3b36fdafec088ce8d6a6e3433
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external PDFs hosted on various websites, many of which appear to be compromised or disposable. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick the user into making a phone call, a common tactic in tech-support scams and callback phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akconta.com/uploads/files/puvovabapukisugeli.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/63ao67vdaoer1fd1koqate9f9h/bafadepe.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0b89e82a79f602dd30607c9dd0a8aaf2/tutisapelakanekeloditaxef.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_995D85D6C9C4E62E.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6c28cfce7ef66491fc0e334acbece3e5/kakudosagupiraviw.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020202433126.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/rofaxafemivadofafevux.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/71125549919.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/32369511256.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/97414039486.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210906_C55F9AF9E57EDB00.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/sukudegikoper.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/sokomoguxakolide.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/donuguxiwozupamo.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/vefeniruzutosatiridakep.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/jezadogawebegowemaxa.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/54427921264.pdfIn PDF document text
    • http://telecycling.info/files/file/30399814899.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/95651020897.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4650ebf6f---petevizusezefonexogapubo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05ea4cbd8---mekibogigofapemozebugu.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/dazowibuforatawonegilabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+second+number+for+telegramPDF 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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 17776 bytes
SHA-256: 403e04cd6c6ba5c3c3c2a84d0567fc63e489641faacc891f599527df412a57cc
font_01_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AF 10944 bytes
SHA-256: 31687a773bfe0182bdb79b2cc5da3c3754c4cc24ff159ad14d4e295dd32494c8

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