Malicious PDF — malware analysis report

Static analysis result for SHA-256 09315e55697ddc51…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 08:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa3986daa2b9edc69f5d857c56417399 SHA-1: 4f4622ea432aaa3921ae7237c834010cff60c438 SHA-256: 09315e55697ddc51c6600516be0d6f1c4eff6d9a4b74eab4576bc21d02176e66
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pattern, although the document body itself is heavily obfuscated and does not provide direct textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=how+to+cast+android+screen+to+pc PDF link annotation
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/65603703533.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/35893474635.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408eeeaf907---26524178996.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/38143419398.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/kasevefukenebo.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/77002973598.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161424f48e404f---1307993111.pdfIn PDF document text
    • http://futboltotal.net/images/files/gipowa.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4b3f1f41f612aa2edeacd30fe00ca7ce/3674786335.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/wojafuvonop.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/16408581534.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xovitedo.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/ditonapekiwiselenonibalon.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161430df2f3d31---barad.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210916_AA6D52C3E2509033.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/filut.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/80337846607.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614530362bbcb---50542917023.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/batagezidofijogorijonidop.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/19222088951.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/nigujaperoxuvudugijidofo.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/16863149349.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/42caa020ace9f8b4245e16b02dbdfb24/guxaxeduniniridinukadad.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384ee48e21e---wajiwuvoraf.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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 17696 bytes
SHA-256: b3b44c328d2893174e8e9b7f7f452e8573345fa60c70b3eacd741818cc53ca08
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 10536 bytes
SHA-256: 8c3d6b9be9b7ed20428359d49f3e2b63b8d2679fb882d8a8ec788e7f0855868a

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