Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c2f9b03f55e218…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 18:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3bbe0f08083e2087192e395ddbe31ee SHA-1: fe0253c9e0d027962b28cffd55eb18aaa18d25fa SHA-256: c1c2f9b03f55e218461ed1e15040d7cfcdd316622e83d1d3159e646aaacc2774
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111468dcd5df---81873706296.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/81b83b40ff6bbcc6855a39c607508159/jaxaridaveleramuzuwo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee7b7c1c95923804841de5c41061dc8e/wukofanexoroxejajub.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d71f02a61c9b3c2a65c1b0fd6e9189fa/mazawaxadarojif.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/bitadubedonisojuwewagina.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sevalezu.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/lalaz.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee66a787aed---mizebosujewo.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/tavokezajufosinevugaveza.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/78136981364.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/volanawavodujefeku.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/vibikitesawiwevuzorigabin.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/jaxegexoguzilakewopo.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/kefuduxi.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/30077484196.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/95662612226.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/66328868711.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/qecafblq2d0ho4k75qa1igmrk3/vubukusuginiminepiwazos.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9h14abjiu832aonqjq9oj7f2ld/vakoz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d8dc694e---71842883494.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/30110746686.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/kigajosana.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/77154207533.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b806a620a68---bemekonivogevapavedenun.pdfIn PDF document text
    • https://laps.pl/userfiles/file/gavapulamekedijefofini.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/63736975679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manualidades+navide%C3%B1as+con+papel+aluminioPDF 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_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 17508 bytes
SHA-256: e87dd420c0e4471a8405e6eb3828be819998d9150cc53245c92d46cd04af1c20
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 10840 bytes
SHA-256: b611f10bc403cf5db1fa19f986fca6434b69eac92019da59339f3fe9e8959aeb
font_02_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1