Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ff25c9b89c6dcc…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 12:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 15e7ce0a997bbeabdab74b10e2406030 SHA-1: 725acf3ffef4c9bb8c76fb9bfc48af7cdcbcb94d SHA-256: 18ff25c9b89c6dccf04f0426227c3bd35f2ae101be44039109074c1ccc2d3527
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on compromised or disposable hosting. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=horizons+canada+moves+west+pdf', likely serve as lures for phishing or to download further malicious content. The PDF structure and the presence of numerous external links suggest an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=horizons+canada+moves+west+pdf PDF link annotation
    • https://escaletravel.com/userfiles/files/wexozujobubur.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kuluxizinifagu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/23653bdaa1e19e457fedec525527086d/83421852702.pdfIn PDF document text
    • https://davaocarrental.com/images/file/25649433301.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210810_2C362C230A9FCEF1.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/lipobajixanoju.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/844791086.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/jirukefibekabad.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160962fa6a1593---22243996031.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712b5937c61---sukezelarujulito.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0060ca2b---pavemonudi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/85186501176.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/lasojof.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/tilajajebasenegifujo.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/61378990831.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/6331382091.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2a93b041a51b86836f4052b096181b61/julolivozutejosimet.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/xupif.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160fa73e67f5ce---88591923186.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/rarawafadewiko.pdfIn PDF document text
    • https://patc.fr/imagesfile/defelemuwi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/boxiledewekegedabodot.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4fd61697c---89523907174.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_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 10936 bytes
SHA-256: 3e0ea4f43dd8495faa576558418c1ee4e099278a8636e920ea709bd3fb6e54fc
font_02_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 17012 bytes
SHA-256: 4efb7bc72d47184f27593529eb5b0db0b26c77ccffb79e080d7f739ac0325029

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