Malicious PDF — malware analysis report

Static analysis result for SHA-256 9960b2269f8bbbb6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 07:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3465d834d4dd9cce071d4987b70abd13 SHA-1: de1b1154e05a8f2238fc8883a0dfdf764ed853bd SHA-256: 9960b2269f8bbbb6d0a6b326f453bd1205f95410830836c511e4a7712b44bc23
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable or compromised domains, indicating a malicious intent to redirect users. The presence of a 'link farm' heuristic further supports this, suggesting the document's primary purpose is to direct users to potentially harmful websites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=ubah+warna+font+android PDF link annotation
    • http://style4.allwebeasy.com/userfiles/files/bovizebewapesufo.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/92116086378.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901233819.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/legovubutufufezu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161486d15d20a0---laxiramufukike.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/92162948396.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/janapukufasipa.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/kuxadosozad.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631612515.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/mimuxulawubidofav.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/zepawapewo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fb5a0dc02139141494ba2e436468dc09/12326712056.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/67000366462.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0cc6242b0---wuzusarabob.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/jewaridorotadewed.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/fugokitezipopa.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/tutudolukelefojefa.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/dofirawategasuv.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109250500158891.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/mikixakuvagij.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/rufelodegimu.pdfIn PDF document text
    • http://cocoal.com/uploads/file/wofanolosototipu.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/20393986171.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/movomi.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/danogak.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ve2281ou6qv8ijm4v5luojlg5a/pawafaxogorali.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_off0000b557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 16924 bytes
SHA-256: bbd5abb4ed8a74437cc99120d9444b2af7e2a4e66f84f9a55045b13498eb45d6
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10340 bytes
SHA-256: def3795b4f1e9217b26ea429c4dfac7e3011614e6300d06653d7c8c80d7a106b

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