Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fe6aef424866ab…

MALICIOUS

PDF

88.2 KB Created: 2021-08-25 04:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 562b1df181151afd749c7f45345df198 SHA-1: 8c0e26b3765c37a29d30f7ef6d6ad4100784a84f SHA-256: 91fe6aef424866abd0c64a65d9c56fd2321975f8bbb1f08a01e8867a25752c71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, aligning with the characteristics of a PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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 http://dd-eng.com/files/files/30574941034.pdf In PDF document text
    • https://sona3elkhair.com/userfiles/file/fidujof.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210616_32C273CFE852EDD3.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/febaxatajetifejarogaxazag.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/44364079560e33f8036267.pdfIn PDF document text
    • http://18554080.com/userfiles/file/sadumajadakubomopiwa.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f40d4c69e7c895884c74f1554793610d/54745652806.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/tigerogilur.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/78935918925.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c72b4bf755aa46c04d6087badd24b08e/putatemazidex.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/34dc156247081dbe009953a3f58e68af/51426488959.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/70092467677.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/n3cpsd5c4ofh99tr5f6j4o57mt/514790160.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/94370626185.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kasivafofafukivegatidag.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/24961574354.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/fabaxilajobijizapitidu.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/22371686460.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f0b82408b8d13b1cfe90ea1aeb9bef57/morojemebukarebirosezerep.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098a4559b42c---23704270695.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/dixisisadifen.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/84cf9029d8875b896c4309e200615299/bivaraboxidojipitejoxewod.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pn3ilo00ktgro3lcv7am161u42/76889460332.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/28525413446.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7eb980bf38e5847020192332b4a52c85/jeruvosemixubapujekado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=congress+took+over+reconstruction+from+president+johnson+afterPDF link annotation
    • 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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 19484 bytes
SHA-256: fa015ca01e093ae7629ecca2aca7911f7029f81dd4e650b22a57f90646ef4b30
font_01_sfnt_off00011cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAE 11440 bytes
SHA-256: 095bff5f8973362fc2a8cbac4372f4cd0c096a2cfd70aef0e2d1eb766d50117a
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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