Malicious PDF — malware analysis report

Static analysis result for SHA-256 6438ebb436990978…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 00:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 623a059d95e1373f3084e683bd5385ab SHA-1: f79a76377f18c845001355c619e40dc9f61d359a SHA-256: 6438ebb436990978818c97a36b2ad09145e108299cb0d763ea0b09713b5c1b80
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links are likely used to host phishing pages or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9342bb8a---63592296725.pdf In PDF document text
    • http://palenice.net/obrazky_clanky/file/ganozasofibalelatonep.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f24b9ce14874f1ccfd4621f701fb30dd/95216912909.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e5ee034e---kuberazetijo.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/98744426884.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b4b09f78fc500ccf7da605d90e13870/73605112349.pdfIn PDF document text
    • http://18554080.com/userfiles/file/39812840887.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mejikexuwevaba.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758dc8d1639---kabavofilejijakutikivodeb.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e861a604bd72f252ac2d7410f0a9fdce/22521571792.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18bbbdd998---mifelopoxapi.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/908ba130ec2ff3539b983bd2c7fc1e1f/26034251445.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/616516c2424154e564ee3762da9f23cf/69606435122.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95a640629---siwevovewufuzak.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/567d1ed159edd06e305997ce9192d9d9/fixifivixejemigipa.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/51019120388.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086046bc664f---12929146238.pdfIn PDF document text
    • http://yoron.net/up/files/vuxisexu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/bufodawitigagejekirava.pdfIn PDF document text
    • https://argumentua.com/i/file/27142507207.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zekuwaba.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/57135709390.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a654ba9fb3b---roguragefaz.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d4f0bf4cc7fcf038fd80f81f34d71c8e/23014352147.pdfIn PDF document text
    • https://stvorki.ru/files/file/88109274100.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ce348804e3e6b8a784fe9fa43e22b56b/26849347218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=proms+in+the+park+2020PDF 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_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 10804 bytes
SHA-256: d478a46af2e0f1eb6aa811e75ee40a4df2c441864b5eb7631933642a26fed123
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 16880 bytes
SHA-256: 0a1d874590754001b2c6f5d6d763dbfd3b497406c3f55555c6b843aac7d6fb27