Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7bc59e25e9cea0…

MALICIOUS

PDF

101.4 KB Created: 2021-07-27 23:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb6972408ed4e7c10e2c1e83c538642e SHA-1: 59a6983938b4dec3fec4a4a6e99e23fc949efce1 SHA-256: dd7bc59e25e9cea0c2b393adbe580f286a54119d6134471cc2700fff8f653232
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of numerous links to compromised WordPress upload directories and disposable hosting suggests a link farm used for distributing further malicious payloads, likely disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3736062537---rokixisuxereg.pdf In PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/23262330986.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/kanazifidimomemaxula.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a09835ccb5b---pijanogekoloxavovule.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92983581487.pdfIn PDF document text
    • http://wami.cc/data/files/famigunakejul.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/67fe59be2fb019345a06616197e5ccfa/dojirotokelidiwimom.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f965c4ee47049fc3c0f23e51cad70d33/fivitexolotekeduvan.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/943gk7epahohr8uh2nnloap8nf/weribowoj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc07e8093d---fuwuvajovolufomabofok.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/paxuxawujed.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268f989d6d---nirifosogopelivujuret.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/30675835752.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e4edf39e7---94634831313.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b598ea7f89c---67090804618.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xegowovabazajem.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/5964981400.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/84399114819.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/cgap5hiahapunodmsqb4ccuo6i/19993854195.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/20778112576.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c3bc3d00ac8f8f3fa5993f902aaf0918/79510006880.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/sooul1qrmri5ms7v9rgim8l7hj/nakivufazutetix.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105131821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ultraman+fighting+evolution+3+iso+romPDF 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_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 17208 bytes
SHA-256: 3ddbacca45d473191e29675c58b26ed485eddfba264e88ab6814d6e1c81b4038
font_02_sfnt_off00016c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C72 11004 bytes
SHA-256: 05df4464a5ab391e287c0e559bdfcb02d3cf52c9f9d8e11ea653ebe4cce70626