Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a9ca5c696dba36…

MALICIOUS

PDF

77.5 KB Created: 2021-07-03 11:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3060b0cdb4de83e183432b714fe4c0e0 SHA-1: 59ebdeff62ce6d0448aa7eb7462a2bfce134412e SHA-256: f8a9ca5c696dba36c673c4d8c92c8d620cbad90a5eaac4b103512a6e80dad9b1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of multiple external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://coretry.ru/uplcv?utm_term=types+of+sewing+machine+ppt PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1af9501b4---37556537876.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5a894a9e4c3a007d341a5ce1da4aefcf/lebarazupogikawoxoxilije.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210528162212.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7811ff685390b3701448f6ef24d5ccfc/6604638797.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/fujiv.pdfIn PDF document text
    • http://indecomavo.pl/inc/zaredekatipurezape.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/renirejixujuz.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6f9512da---73469968637.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896bbc464f6---zexoxerodulemudasadik.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wiramumofulererifexigaw.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/18004900677.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78b199f2e---wosupijitevagosoxofemab.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/43395619103.pdfIn PDF document text
    • http://coffee33.ru/archive/file/89789691769.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/4950021258.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3917e5a1bd600c7c1421fab054ffe1f7/32884596250.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3vablunnjb45886nv379i0ojpo/46084170274.pdfIn PDF document text
    • http://teknis.it/userfiles/files/46962733010.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/db2852e893014767ee8d4265b6569e63/11056915259.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gejogipeguxonivibe.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2d8c88cbdfb7461aae3579553b9d5830/86126173201.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/55755673778.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/77448349397.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47b9b4cd8---11122914837.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/989e11e0a6424d2abd4ddd38773b1d54/fuvewirujepuboku.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_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 10944 bytes
SHA-256: a9f574850db9ac1422a06f2c9dfc3262510c5f625de3ad61d61dcee3a4e5bebc
font_01_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 16376 bytes
SHA-256: b1e3877d612343573a21da699bf333699b468d8b25426fab39510bff44e40394

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