Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e746fc7bf57add0…

MALICIOUS

PDF

77.1 KB Created: 2021-08-27 22:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ea8f670c4925961928fb82b0594bf2d SHA-1: a10a0cbd4628b2fcaea35a568f8efdd672fb1971 SHA-256: 9e746fc7bf57add07f116f8f4dafdbbb04ce55db62a5a3789303dbe87e1d068d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm characteristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=competency+meaning+in+marathi PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1567caad5---rofubafeg.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43786ec4c---xubepojawitupukojo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cd883489d8696bc021b8ead49798a3c0/39371927036.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/23218787249.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/74813460989.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/63041124325.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/8da28d7cca50994ba713ef6cfc833680/kedukutelegogeg.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c0d2d614687857e7e06ff871e1d1f182/rexexosifegoxulawi.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/xiniruwasidojukotajawubo.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/23429170751.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/22598293971.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1e48463671d81b8728e49eccb8d03fba/11950393235.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/97915688399.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lbl0pdts6ugo1oouj4npsfpl9a/53243610792.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/kikuzerijisewawisajoxodew.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/caccd4c135feaf32e2319c213a4a98cd/nokufakejewalupepa.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/gifuwesoramozeguramor.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/korotuvaf.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/p23hkqgpr30k5l9801nq1rhbc1/87168394085.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9j2fv0med4hv71m3khf24o8crt/95346388856.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/9c713c7017341e5ec4881c90a45ddd15/97977256821.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/fanopuliro.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/luvoxifuburawiju.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/93009250650.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/tagisa.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_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 18224 bytes
SHA-256: 975423f645adc19ada11898599515c9b0e1b35358b14b03877e1f54a690c79d2
font_02_sfnt_off00010da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 10752 bytes
SHA-256: 2f36cc900368a9f28f408f1999e5c4a0b9649c3c39f0c965041e4337cab55bbc