Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e92a01be079e6e8…

MALICIOUS

PDF

82.6 KB Created: 2021-07-05 12:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17800c3b7d06b3da4fdbe384518cc67e SHA-1: dc8185d94856bd4dfa9b65ccf70ccd6a669f0e07 SHA-256: 5e92a01be079e6e8d6487bb5a33d462bb5ae5d4116057ff0e7b4364d2f1024d9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised CMS upload directories. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • 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://aihr-iadh.org/uploads/FCK_files/file/77938191410.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fisixawapevavaxukizeki.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b1f4cbbe7b6ed6962a8b3d0818ae3f0/69604374111.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609487379d4a7---jidogivibebitiro.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608657244531c---vajoro.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nejib6j8v89gpkpqvmpbskfujb/kidelakoxinez.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b489d7903a97abaf0e650a1876a05662/28354493184.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/sidurubodafatopux.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/91363853963.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/9f25dae32b1615153cc6cb127825df15/sezutexusukewegusinufudef.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1badc1e5---34263917708.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/82316823863.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/tuzefixevevufo.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/zegefikutikemolakozelufo.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/dibageve.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54ecee2b6---66184263019.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d44c48fa32ad127418854ec0926645c5/bulofitusuduxipevadel.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/3894044121.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a42dea67d90---34496196820.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1a61a537---taselozikakezopakajego.pdfIn PDF document text
    • http://asfalon.com/__files/file/53793843716.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/nopol.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf911710f8---laxijejod.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/88919293978.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/jejofasolivimexikimawomav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=indian+road+congress+code+pdfPDF 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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 16892 bytes
SHA-256: 4bbda5a0393cfa2dd8ffd04ce80b81feba1741b81fd527b6368e3de7183f9853
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 10600 bytes
SHA-256: ead18834ae52e07f0fd1d9721b68fc857b74ecd17cb01d738b0a22edb79bb636