Malicious PDF — malware analysis report

Static analysis result for SHA-256 810c59ce86a16d8c…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 19:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6edc2d8165f091101992a75f21287a4a SHA-1: dac5d029ef00f0a6c8f32df04425271ce36d0ff4 SHA-256: 810c59ce86a16d8ce1dd6ab069fe50c392af4e6d62ed735a41d6e92106e3b359
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or facilitate further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4d5d91m2jaltbdqeke4m77b6p/63628699710.pdf In PDF document text
    • http://roocenter.ru/upload/file/13498978083.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2086a024a7---wewipazinakizaxakago.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/11625273671.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kinonisarasutagopumad.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/88440426542.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/79463414237.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/10565278862.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/pejod.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c588356de2878cad9a0fc67ca55e9810/wigikafow.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/rovopitovobigifosutat.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbafeef9ab---totuvezemu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609117545b071---27555725142.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/gisutavanorogexadisuju.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/raseleduwutuf.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/81062065557.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/tipoxunajenoxigofapevizo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/donisurisew.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085820fa0d14---82950618519.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608abe797bd22---6800105845.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/f604575f82808b2efbae01687d767c6b/70945465997.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/17097432311.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/7298712165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=arctis+7+headset+manualPDF 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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 10644 bytes
SHA-256: 6f56430f0682d90339ebabab94528fececb3bfa171b2c24ff7b8ef2c9b2b89d5
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 22972 bytes
SHA-256: 9bd8484c830f7552e010fa5155c33eab0a5f5bf56a5b36d552dca7cd9c3e75b8
font_02_sfnt_off00013ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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