Malicious PDF — malware analysis report

Static analysis result for SHA-256 5373542b57ffa73c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 10:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1220c0849e94433789235386a33e4b63 SHA-1: ea02ab4911490fb1ba123119d339df77f90e54fc SHA-256: 5373542b57ffa73c462d0c60b2b1e8f084548c22803f114ff735b2ce8a76b54d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm hosted on multiple compromised websites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. These links likely lead to the download of malicious files, as suggested by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The document's purpose appears to be to trick users into downloading further malware through these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135219e48491---44347250175.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a97d5c30a---kekonenomakikis.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffd167dc1---tixun.pdfIn PDF document text
    • http://flexa.cz/docs/file/24266126614.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/38018204037.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/61084752041.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/kelorasumu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613604bfe12b1---80742337208.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///bikigovafe.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fugan.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/xewibuzaribawisuwu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/42738063682.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/pulom.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/dugobogum.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018e8a3ee9---zerevijenixejusujuwi.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/71445721946.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/28309412927.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35ef9a044233e8948a7cc3ca2755e1b0/ritoguwifo.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/foxoroxabufi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318368cd00d---93176348103.pdfIn PDF document text
    • https://websbag.com/uploads/files/befokakasok.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/vogowepubufogizomanujon.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/ginevonuvabep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sling+drift+downloadPDF link annotation
    • 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_off0000cff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF7 17352 bytes
SHA-256: f4a2c414e98e15793d522a1984ac3fa79f7326fdb91480cef0198bc4d82f18e3
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 10392 bytes
SHA-256: aabc813b0b6c323251462f4f6ea7e00db2fffbfa371acbf1d1a60fc5e3b2b814

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