Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8f1efcc0b54299…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 23:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41b2273e09551d0b604e6b284f5b405d SHA-1: e51bbd821ac5716b9f6b19a950b87f1be2c6e518 SHA-256: 9f8f1efcc0b5429923fe0e7f5d9828edd94159ac2ddd8108a0ccac7dcc1db5f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this pattern, indicating the document's primary purpose is to host a collection of links to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=calendrier+septembre+2019+%C3%A0+imprimer+pdf PDF link annotation
    • https://wendi101.com/userfiles/file/danafi.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/rosazo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9f8d93c37ae985020689ce66efb1612c/zajavanezovekifusekulo.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/dilamamosavuwonobowukuvi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rpngnnth1j7rp30s9rjkcos014/78142043489.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/miluj.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/71979326607.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/54938699413.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/35381c12f7ac12d44118766d065cfb9e/74901604727.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/wexagetujofewufuturoro.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608008749211d---fanunutaviwufima.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecde76a72e5---befinulubezopigofe.pdfIn PDF document text
    • https://aashianarealty.com/file/77561168155.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bd0e9193---20705825211.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608854153a549---domevabetidudizeleveda.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/kelawazamug.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/udmbt5ooudamkd71fqs2v5qqgq/33730271651.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/tovidejelis.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/radesolomituwodi.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/xuvogivikezidet.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd45377c6---budekikikipemud.pdfIn PDF document text
    • https://agermag.ro/mm/file/15159345764.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 20072 bytes
SHA-256: 3697e3dcf56f7c2361ce32be057de74988d9a9d5a46c45b18eec9f31c7547b6d
font_02_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 11356 bytes
SHA-256: 20fd290af50d586a561076be3180d024340465136875c46b352eb3805bbc26ca

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