Malicious PDF — malware analysis report

Static analysis result for SHA-256 1904077ab1b57098…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 04:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 084915d4e5821f93e946b39181a4f4af SHA-1: 70fb03aff228c17de268a55d692e3c73c99a6c27 SHA-256: 1904077ab1b5709828a9aa39b120ff52ad42e97f1cd3eaf8a7ce35b346c2d759
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd0b57fb14---94284006317.pdf In PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a4bc0ec9726daac456801187cfeeac11/geruworogowerofisuw.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/dufuvuvejas.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/seluwu.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/gupozopamiwipixusedi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa95ac4d63a3632e4cdc1d0c55a7b453/sisilodafovigesuriwekefup.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/11765577921.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092caf19d4ab---70409751997.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/zidaxuwidafogevorozotom.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1178e2cd1a---23745970251.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608593faad8dd---rulukel.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/38715006447.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd74d50e1e---geralofenazenodidobonoliv.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1197687706---subiduwunuselarup.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160765963c3982---lizutetafado.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/bilaxafamalixuku.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7e2880f506ee22388ed04d24d3a14918/tunos.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hi15hvgmkjlr9jk9erisq133h4/revefujufojewune.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/53972027593.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2f5d4b228f96aa93b0b9b8e2c57e59bb/femubomenokinobolutugad.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/44222527249.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/13906855dba3f296a201fefba6bb6e5e/kejiwupopetiweku.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/50201321959.pdfIn PDF document text
    • http://attlas.center/userfiles/file/xurefofoveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=elements+of+literature+third+course+holt+rinehart+and+winston+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_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 11056 bytes
SHA-256: 4509fc078292ecc6c26b69c003909e86325431a578f9343be04a7bb2a7d66e73
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 17608 bytes
SHA-256: ddf9169805fa052f2d7668c1da43bba2cd544f263077d42438d85bd6972b9ea1
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1