Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8f6f7f1e2f37b0…

MALICIOUS

PDF

97.3 KB Created: 2021-09-01 01:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ab6062e13a3fb45627fe4b12d86eef5 SHA-1: b4b531cad489bfe9b67f06f346df59232d824547 SHA-256: db8f6f7f1e2f37b04e863a1adc7a2dec290273a286adeaf3b3a8f5956e2ce5ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to distribute further malware or conduct phishing attacks. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d484692016ea4a587026092f719e41d6/nafepor.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699329907a---gopivetumewedajenew.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9b16a621---4545164621.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/kq1s84lmkkuh8n9u83eq25kvt4/40361232697.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/94958093918.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc9518eba---79650032685.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/dexonuja.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/nepegudugawiketowazito.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/fobidoruwojalena.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/lapumidesumigate.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/15530748562.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0754faea9932ac64d137ebaed5768243/kazudelimifajesigilur.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/wefisexorazijadavigaza.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/da53f67fb92a93606e49c0d05a1e06b4/gipepem.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06dae566d---66964352209.pdfIn PDF document text
    • https://termoformat.md/img/files/pudinemewejafeluwoba.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6f6f295af0e0c70205cb27a43393e9a1/bulilunel.pdfIn PDF document text
    • https://ubranni.com/uploader/files/32760465222.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4518dc6e25---35191853427.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040359417092.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624775378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=accidentally+in+love+book+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_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 22248 bytes
SHA-256: 26610c595f8344ba8d597fb92796ab882ccb436e50e6dd34e70a5a1c6c45713a
font_02_sfnt_off00015e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E79 10740 bytes
SHA-256: 8619942b0006df0334078d8cb9ea370ea40c56d7811adb88906db6f202341b74

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