Malicious PDF — malware analysis report

Static analysis result for SHA-256 af31725184338993…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 19:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9b79f82f4c84f91e6a2edcba7770b3a SHA-1: fe3dea236536efecb0b5faeaaeef77a9c6a509b5 SHA-256: af3172518433899335a7ce2b08a94ae999feb7c052e757b15461074cbb3b4149
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate a malformed exploit stream and a link farm pointing to compromised CMS uploads, suggesting the PDF is designed to deliver a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=meaning+of+the+name+joyce+in+hebrew PDF link annotation
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096548503858---vegojoregumufiwe.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/39307133143.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/13393839637.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/59480634108.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jiuqv6lb1rrqv5sd81fickjes3/41386964078.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-01-02-50-05-49.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/satidavobilufuzejot.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a53215ef---kogukizisegotudifogajifer.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/tixipexixefupodefonug.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0943296ea25c7781c5d0282b70156e68/24927426246.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a78a3e5164bf2f0348de82d0afedf30c/52344046039.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/18998524314.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/17603561979.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/55207147779.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/69576607904.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/wugunagepipadezad.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/71388450042.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202108281416569653.pdfIn PDF document text
    • http://wdnederland.nl/file/goxamotozupas.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/58549575474.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/belukopusenedalagujeraf.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad214dd169e---bilafun.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_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 17316 bytes
SHA-256: 8442cb55f3fc7bb34c559af9eb26c0e5ab8aaac9b5fb6e1eaa2bf9f83833f045
font_01_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 11032 bytes
SHA-256: 821446d1779ee9aedee107867a207dd324c8e8e6a8ee935ed9058c93a75638a8

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