Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e550327f11ce3…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 08:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 339f9959173420b68acef088c6e529f6 SHA-1: d054afe9eb4cb2389626a1830003536c263223f3 SHA-256: 4a1e550327f11ce34674d8d3eddcbdca36d524ce68f147cc1894d9a4556e1181
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malware or lead users to phishing sites. The presence of embedded URLs and the overall structure indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=dream+league+soccer+apk+obb+download PDF link annotation
    • http://vuason.vn/upload/files/mefosibisuzodusepanaguza.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/nokuv.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81615846541.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/magejawosowiganosenodego.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/pazegofoleritat.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/xejukeroxivamajamis.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/56903601220.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/50623143896.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/8819158009.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5533da856---3344381646.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/keverolorovax.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/zuvosatabexuletililuxo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613488af8c138---nineburimisesixajolo.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sowetometotituwujal.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/bovegaxow.pdfIn PDF document text
    • http://ailizia.com/userfiles/61266526286.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/9426485802.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/58302555533.pdfIn PDF document text
    • https://icbacademy.com/upload/files/megufaku.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/64f6fc71586eff544c7546218c7de3c1/54326613792.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/rugajome.pdfIn PDF document text
    • 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_off0000bcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB5 16828 bytes
SHA-256: ff87543d740700b9aaec97d3c27ba7afdc0a33df5239221f5536f63d33845554
font_01_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 11084 bytes
SHA-256: d385bc7879530121764e28463a2634a2d6c49508264731112abf42a83f8512f4