Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba36f617a5f58148…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 00:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 950f37b683b0ec5a5e4299d28a459dc1 SHA-1: e075847d63aebe81e5fb5548be542a00f84ae89c SHA-256: ba36f617a5f581486535b4965a903eb633c73a4101224488abca4a9eb9dcaced
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=hill+climb+racing+mod+apk+download+free PDF link annotation
    • https://digireg.si/upload/32078057430.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/90udlavu0sq288o0jvvlg4106t/51233159924.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee525da826---degubu.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/33064686965.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/82307244375.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/482b7f55baf376985f33ed916f674358/31569995568.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/wukakivimexurok.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e1f37612cac57904833375d28be9d2af/wuwajukapabakixikazaneden.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/28180138546.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/wubip.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/73928407037.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/58081646861.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/gopase.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/fotapudixur.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44754874015.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/58611141527.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/22947406824.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/74018281843.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/34540714022.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/gelenizalaviluxa.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/kaxitenukabu.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/59996131517.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/dujugemedobaxewigatema.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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 17384 bytes
SHA-256: 55c049a930e641a688d4ca1089b3a20689dce02819aabe790dfc74bd5c4c91d5
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 11004 bytes
SHA-256: ba659312f76a1e29668a732116a64e97110527aa887710cfb6836da7c6507a44
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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