Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93ea5b7d37bda9b…

MALICIOUS

PDF

68.3 KB Created: 2021-09-21 08:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66182560f7af54236a8df8ebfbc4e076 SHA-1: 82c9e5dacd44956bc161f79ac55e3660eb04c1e9 SHA-256: d93ea5b7d37bda9b5b441edcd74bfab8b5c954dfaaf6bbc849f94aacd850876f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common phishing tactic by presenting itself as an image-based lure, encouraging users to click through to external links. The embedded JavaScript and numerous links to compromised websites and disposable hosting indicate a clear intent to redirect users to malicious content, likely for credential harvesting or further malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=du+speed+booster+pro+apk+2020 PDF link annotation
    • http://cana.vn/uploads/userfiles/file/fejaniwiwubu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148341b8140e---fegokubo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484055466db---jalefunexifirili.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210903121415388002159nsi.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bopizadujokiduta.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146ef9aa2e19---45412213388.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109090851173968137dvu3.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/1253435936.pdfIn PDF document text
    • http://sinostandards.net/upload/files/63673333632.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/94618858354.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/bevutirenudirisa.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/mosobuxit.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lenilexikobofe.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/vogelomotipegoxaw.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/54099181942.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/14933805289.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131686d203df---71043977835.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/pegetepefewazimesesaz.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/55160974479.pdfIn PDF document text
    • http://wamer.org/userfiles/file/naposurerigo.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/31109982588.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/69954579663.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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 10720 bytes
SHA-256: 34f810041758384be3259a340bd9be5e0c275fa897b72fabf894ff4254c98e36
font_01_sfnt_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 13944 bytes
SHA-256: 4eae04e6211f6bfc3be2c251154eba2f71c3f57971b0ac53a044feed3f58f381
font_02_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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