Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf79f429a64f020a…

MALICIOUS

PDF

99.4 KB Created: 2021-09-05 12:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6f262d5b82dcedb5d2ecaf8a871f482 SHA-1: 11aefb78fe2e16ea6fe99de1d0986ef2f9a038eb SHA-256: bf79f429a64f020a9110e7366fd95cb33ea2d7b429cb20a8fa83ded339002655
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.2227

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://synerhu.ru/uplcv?utm_term=dicionario+de+termos+m%C3%A9dicos+pdf PDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/mnkt95pq2rim3ln6qj18cs6oa0/64128360809.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/399063caa14524c24bb4776198f05fe6/wijeberogenelosiwirujaw.pdfIn PDF document text
    • https://people11people.com/uploads/File/88323048183.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/kumirifulepojaf.pdfIn PDF document text
    • http://atek-ent.com/upload/file/9149597415.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4aobmpegvi83jpd78dk3mvnv2/53429950688.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zexojanirewesipixomuw.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d051e45a443---rasezusuje.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf605468ec5---lirikifedewosuwazopa.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2c4b093d---96173662820.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/82807573236.pdfIn PDF document text
    • https://fultoys.com/userfiles/buparuriberilire.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/75871820083.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a739dc4a---12782093987.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100873ac412e---87627602516.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3882cece47---wopiteliwinokixes.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b696fe0eef---67711263970.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d68d21329---powipufimilufip.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/xuwupilapexalarazax.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/loxalafaxujiratolopomeze.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/118bfb0008165e5a0541d485f18a7f83/wikuwovopoborezu.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/84627198270.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/pamexuletelerelerubidef.pdfIn PDF document text
    • http://minipit.com/data/files/31534244392.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/65116745228.pdfIn 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_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 10888 bytes
SHA-256: 9bec40b32d8d27a95f75045b9eb6f897559956d51b1f3178feee2a468cd66155
font_02_sfnt_off00015118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15118 20740 bytes
SHA-256: 8a10ef3535d2ad202375752c8449e235e9570b328e4aeecb4f1da0104c0be0a3

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