Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e4eb5aa7ce308a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 17:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be57db359e5220c8797e64b356a2482f SHA-1: 6cb18264d4a8fed4ba15c4464533c41b0fa7273b SHA-256: 17e4eb5aa7ce308a06c23d569717ef5c9b904eddc61362c38d6d90a50ae30642
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=going+to+eat+in+spanish PDF link annotation
    • https://lenaoyunlar.com/calisma2/files/uploads/roxunawaluwiguvugi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/gudevafudi.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/72925656267.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/19135996925.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac8aa877e---xomojetefaluwosojurero.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8a323d7ef21a9fd372968cdc38a612d6/puwotobajawotok.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/72676415387.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160725445309e4---26253636603.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0d2nue261k3gmfcl5sv7efui55/98002189049.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/revaw.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/kuxuni.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/rajizo.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ec563bc247a8fd1a67ea5fd1c4c9ad46/37012885605.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7omltff0kpn3anvvmiftmeuahh/14458558264.pdfIn PDF document text
    • https://securitydm.com/slicice/file/dedasemober.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/91203236603.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/62002103942.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b07b910b65f3072f63ec9ceb0229b1ce/gesiduzet.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gexekejevikar.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088b9d5be703---95053875724.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4b583d34---63108015214.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/47151289268.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/varupon.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_off0000bb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5C 10424 bytes
SHA-256: 8d5df4f8d8aea1857346f562ee614bc8382b90c867a2b23e165b0615e1ddd38e
font_01_sfnt_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 17448 bytes
SHA-256: a765f9bd6453ef7cfa37663deff9d88a2096a1504dcd5a87c2191364157bad36
font_02_sfnt_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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