Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feca7869a356748…

MALICIOUS

PDF

117.8 KB Created: 2021-06-23 03:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fb1503a6513e04c05d846ff376b652c1 SHA-1: 4ffc116a51341308961157f39686ee15d74d4c0c SHA-256: 5feca7869a3567482749503163c5da61ab99fae422980c991e0c8bd77d7fbc0d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, aligning with the 'Pdf.Phishing.Trojan' detection. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=do+pdf+para+android PDF link annotation
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861cce59c4a---lebevikere.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be71896fdf4---96883688216.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wokufuwalaxegudesopo.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/45636390113.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160768bbb0f655---77529230806.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f277e6f6d4---83980516675.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8b33938439147fda44ff1e795a7aa669/72869571590.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4a476ace---vitebesaw.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210618041112_c9ec6y.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071702f3f95b---wuguladol.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/50751805498.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/wemoneme.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040a5b55aa---52479376465.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075585fa499e---fejer.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/zaxerozuliroxopakam.pdfIn PDF document text
    • https://mauspro.net/upload/files/22669671980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/bac299f3e45b5c3a796361e70a227c7f/80049440014.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB6 4824 bytes
SHA-256: c58f3b3454f51a749b9e52eddfa766063ab7157743f6a2bfef8eefbe7a1da2d2
font_01_sfnt_off00019d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D34 14612 bytes
SHA-256: d3c54f6ce28d86555d48133e069db35941c976b8cf4f33b231c5064e855bb5a7