Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd92c104aa3f7fce…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 01:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ca078493cbcb87cdb5a276badb80f17f SHA-1: e211f062de112d0b5c3c9d7089f6302615e569e9 SHA-256: fd92c104aa3f7fcef7134fb6192f3215573d608728db1a91c527a29d12c8466a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=the+fun+they+had+short+question+answer PDF link annotation
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gro20qvn66suce9cn088tjdvc5/beponi.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/57111946784.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/totarawav.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9b851323---96796617737.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f21bcf38b1ceb11341ea0e6eab3b1a9e/97704649589.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tabaperakisawenapiwatora.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/89950066408.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/27789328610.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7sh67ecb1cvdekfp36s2c18rt6/89979814645.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/wiwazina.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ptjn5vleaobrf3hf049d0p1qd4/leboburozudedek.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2673230eb1f8d966019874e935ea9c06/48159512374.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/piwepufine.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1c8d043e---84737761264.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f3198718856aefb82bcf7322b77beb/mosorele.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/74810674000.pdfIn PDF document text
    • https://latework.cz/soubory/xorubedorogagakomim.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/1896949666.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d0af1c14---42649928981.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c2ac00cda2e8bfd8438b7179de2fc22d/surin.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b3bc323646b1bdcf41bf7642c1b1a4d1/90167671072.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/tazifuvazegilopolumupi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/0lmtdejp4ip29nefu1r44gpa68/banoviboropigeki.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/83235402851.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_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 17388 bytes
SHA-256: 78a4381d72bc106a552c3d1a5e442552caf6423eb2f2b5aa3a305431832ef6e5
font_02_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 10816 bytes
SHA-256: 9b1cdc547067fb87c437b90adc4ef3e1c3e7430ccfb98f7f0ba3f96485c0e770

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