Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfd2323762b4cf9…

MALICIOUS

PDF

105.4 KB Created: 2021-09-03 20:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 439365e66371f9698d2aa68c5f0f5e57 SHA-1: 37f71108664a3b224c11a40b4d1e56f56cec5a26 SHA-256: 8cfd2323762b4cf9b60f5a463b59ccc0c0355a62e208dacf7868d0b723211309
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering a payload via the embedded script and links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://aeronautike.com/userfiles/file/50237221745.pdf In PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/93082425756.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/77504096872.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/17626550337.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4d1b23f3a1e8e1f9539186764c066181/rexikoluvonatavuluvul.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d31f6fa66c3---4624838790.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/14081847900.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/newumasulup.pdfIn PDF document text
    • http://alltechsro.cz/files/11397091103.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/9835333332.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a89dec62d449df5aa48147339960b5c3/dubisezowujupixewe.pdfIn PDF document text
    • http://ailizia.com/userfiles/85457786468.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/23951304573.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/lituwob.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/dk9c3htav2v2g4amdffj73mu84/rusepuzubitofus.pdfIn PDF document text
    • https://jetaime-shop.com/files/zuxemikunajix.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba51068242e---bojosojonuwutoga.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/12758005238.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed2852d2e6b77549eaac554362bdb57d/60333863535.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/19889200246.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f1eea8fba7da6ce75a8735d14c40b6aa/61476225428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=airman+compressor+pds185s+service+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 11120 bytes
SHA-256: 437757c817c406f534270202141326194ee9927e5da39243cd54cc5dfea6cdb4
font_01_sfnt_off00014795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14795 20604 bytes
SHA-256: 1310dae4aafc650a5582ec746363d7f20700bf99615e27703f9dd9a73a5f27ee
font_02_sfnt_off00017e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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