Malicious PDF — malware analysis report

Static analysis result for SHA-256 f066338cc108edde…

MALICIOUS

PDF

120.5 KB Created: 2021-09-05 01:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78474468304a9a343f4255146c511674 SHA-1: 42f99da4c3f36f045bc24193ab0c904e3efe9b94 SHA-256: f066338cc108eddea1a5344438c7cdcc4adae7655493b68a3a86e08468f1ec90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to compromised websites. These links are likely intended to lure users into phishing scams or to download further malicious content. No scripts were extracted from this sample, but the presence of multiple compromised CMS upload links suggests a pattern of distributing malicious files through various compromised web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=5+fruit+and+veg+a+day+worksheets PDF link annotation
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/62958014436.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/16328689747.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c03629cffa3fe7c4bf18c0d98f86b7b5/77038173093.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/wedexatapofoxudabu.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/zinopokidudaket.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/06d25ec073ca5678b081b1b46144adbe/74735946412.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c4125679---61857406693.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/jixerowozurusiwerudiximap.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/wudoxabotof.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/forakotusuguga.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/75513222873.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/38599338207.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/gubufunikunelirif.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/20066684908.pdfIn PDF document text
    • https://majubesar.com/contents//files/99405536845.pdfIn PDF document text
    • http://splogservice.ru/content/file/nawetotuvut.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fe909f52a---21674537999.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/754a678a6c0d64b29a3e7e457d7c0daf/didulilipufezexunolu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097727e5d0c9---turupodibopotosuvinaz.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/91348476617.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/om0njh4tossferh9runp6aaqfr/dujabasexinutowilefinolo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/78d1a7bdb5ad088243a7c27af7b697ab/66493807938.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/kodefibitixeki.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dce119a565---foduxijuxubulododederafod.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_off00016eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB9 11084 bytes
SHA-256: 167aa4492608407892062f24c59276bd45d28d50135e8f0d51eb93032046edf6
font_01_sfnt_off00018868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A07A 19480 bytes
SHA-256: 61d06705a88621add840b4a49fcc457fb0d89b6f628a341068800aeee5fdaa78

Open this report in the interactive analyzer, or submit your own file for analysis.