Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ac8a711ff691da…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 02:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42c32162605c04870ca4f8fdf7d1422d SHA-1: eeb28e71ef8de5e159856d5e314552d5cfb2f023 SHA-256: 49ac8a711ff691da3d0f351cbd2b232d6d2cc83f3058fc40a9a237513e779cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://4bx.pl/public/file/14072743850.pdf In PDF document text
    • https://exlite.it/ckfinder/userfiles/files/9620629862.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210902063237.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/zonowori.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/475c0411032eee9eaeffb09ce9402dfb/gigorotuvawazeranos.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/30365105694.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/gamafumevetobojuta.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/kuwunawezutase.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/40454890108.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613372495d3c8---zopisadodekef.pdfIn PDF document text
    • http://potlista.com/file/files/79198506903.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/voxajubuxabu.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/degosofezevegoxaziwit.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7dbef6e7680a9df4e7cc534068133990/85365501919.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/99609493632.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/65082787895.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/jenakanujopozafabulem.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/a0lr3f0lk4piop7p8j1f5h1pqa/xodaweze.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/xabefilibibixavuz.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/18556632473.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kogirifikarawi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613617f09bdd6---96132069013.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/78126936577.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146884b23bd6---sokasos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+bleach+eternal+soulPDF 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_off0000ba32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 19864 bytes
SHA-256: 1f98e697576c312e2206e53f6b6cf20bd51c5bec74f7c0bcc44b3d6d369d55be
font_02_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10700 bytes
SHA-256: 74ce3a82e8337a150b8c03fec098cb02483e4bd7e2fb5766c3951ea37f46f95c

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