Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4303fbc0ead6d1…

MALICIOUS

PDF

78.9 KB Created: 2021-06-29 17:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad045dc5be43db43eb8d30c9968fbf38 SHA-1: 880abad3140770ac2554ba8dafba18bf6cd4d318 SHA-256: 3c4303fbc0ead6d1037479053881612162a591e4908d64e62819c02ea41474bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://shopinhome.com/ci/userfiles/files/22053471170.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160789006860ed---mekofi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vitusel.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/04d2707f0518e961df81c8fa5693e226/89692126335.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d3115ea3a2d---53256743171.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abc997574bc---xugafokapobagununize.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160839f1306692---70871293121.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/fixiwugepanojadigijotol.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42524f832---1206051806.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/pavadufazimuz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd8a85c9d---51867856374.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/308qumrrf83adp5l5ej8miebms/zoziwonedifikupubi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4af6530bf6fbae18fd73fe4cac1c708f/22261629533.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e808927426---noladolelolazuzolezef.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5ca3861e3cb423f368aa7b5ce040aed1/dituwafunase.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/67885472446.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d9b699ca---34634506752.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430063606651253.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/23408032246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=evangelismo+personal+myer+pearlman+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A7 17348 bytes
SHA-256: 4ca5ddd3d55299e11457534f924ec44fc1b0b15a776cbec91afd5ca0ef9d31a5
font_01_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 10908 bytes
SHA-256: 24b96fa379b9a8a3c65150665a6d78433a202c231432112722c695152c23919b
font_03_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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