Malicious PDF — malware analysis report

Static analysis result for SHA-256 82164fc269ce7371…

MALICIOUS

PDF

73.7 KB Created: 2021-09-25 03:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf44f6cc61dd216bc01da768d775f620 SHA-1: 1a5a057e402f090806e6dccbc4363eccb8ef20b1 SHA-256: 82164fc269ce7371b53bb9d25dc99a80c32d7c39f9e75be9b61061d35b1be883
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=wallpaper+superhero+hd+android PDF link annotation
    • https://ochronaskory.pl/pliki_user/File/8131684960.pdfIn PDF document text
    • http://rhondachem.com/d/files/depufisasatexupubuw.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/35428767283.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631009430.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e57fe5768d---wotosom.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/87914602347.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/191598540.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6904cc3a---gidisabirubokiwonelom.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/xorotugeririri.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/petiwo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/kovazigimatiwud.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sexabuz.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/pabarajubabuk.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7932cde7---45530224821.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/57185411686.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_040609.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/lesivofajalegixozulazibe.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/20172054295.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/28253188475.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/munumokapir.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/71776619583.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/191621287967.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/52216641739.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490933df64a---82647838801.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0c3ef11d365bf112d44d94ac8b475fbd/vosewumubuwibaziboz.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_off0000b94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94E 10484 bytes
SHA-256: 10aaea6d0203c846947f19d0ef956cac58ca2f8bcb0f1bf911d64e714b5bee4d
font_01_sfnt_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 18696 bytes
SHA-256: 5e31beaa67b0c237cb1ef2336c81f895fba4140c66eed6a89f6ea0591c6f5177
font_02_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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