Malicious PDF — malware analysis report

Static analysis result for SHA-256 f013918665b7bd28…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 05:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a8ec545ac7641d0e6acb6c0abd44a7d SHA-1: a95357db4d7a2573336552fab4724bf1b3bd4de6 SHA-256: f013918665b7bd285b1f095c825e26375316ae9ad0eecf69860957c947362cf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The primary attack pattern involves luring users to these external links, which likely host malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://monographie.com/ckfinder/userfiles/files/jepobaxiratub.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3ldbmsfqqvo4o5t4e4rqf3qi8p/49770228291.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82e886285---xirisomo.pdfIn PDF document text
    • http://jsdarvin.com/files/tegowez.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607105dbcba47---90727020672.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77e131a4a---gofeferufana.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/runufumi.pdfIn PDF document text
    • http://snsi.jp/image/news_file/buriw.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/66813826043.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c584b4fed---doxaxilet.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/45850655305.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/1af5cfff4a8cad4d0dfb8a3b4155223d/nofonuleguvogu.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/07f0dd1cc128e70dbe1bf444a22dc77c/jitiramiwoxim.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/wizodebinijiluwalotatuwoz.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/88836060881.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623032393.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/fimilezi.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/dareno.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4f64c472---3779164540.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/41411305049.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/51888092163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=if+clause+mixed+exercise+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC321 10612 bytes
SHA-256: 3a2b8ae6a7b8cee38c09d31fb906ad08d02510952ff0c2bb5415f5b4ea2ad572
font_01_sfnt_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 17416 bytes
SHA-256: d2a31ff829d5d2660a09f6b1f261f7d766ab6aa07cb853ead4a3c15937802317
font_02_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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