Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f684f04e733724…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 18:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eca8c006400472c489fd44dd03dad0d8 SHA-1: 545157af7b4fadb603527036fc7d103d674df2ac SHA-256: c2f684f04e733724af368832396c6ff45862dff5ab85bc9a9efaba13d9c1dced
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure for users to download a payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://duef.ru/public/file/mamebizigusudopozije.pdf In PDF document text
    • http://myflora888.com/ck_files/files/borezupotewanoliparudiko.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/jixipabifefup.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144d93edbc2f---ribovopuke.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/39853125823.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/77505758696.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/jokuxonelevalasepuzegax.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/47267301784.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/2605505008.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/76627492468.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144b0f1b0e98---dosesodotob.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/77585035496.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134cea0c47c5---28123235511.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/tadebupogukosojodovemus.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/metatagokusipisekiseb.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/meruzoraterefejojen.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109031644465449.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/dejesuvaditanefadirevis.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/weweruxogasemitavelod.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/12325763312.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/35815394494.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/54184181177.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/830b0d716cb450c434a93680e4e20e4f/68296884079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pululu+mod+apkPDF 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_off0000bfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 17844 bytes
SHA-256: 6f504caf5569caad5d017abd6b1ff8da856df7fa0a151536fe70bb509c06dafb
font_02_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 10052 bytes
SHA-256: efb75fcf7424c623809643b95c2a8219f1d6bc6f567053e00e414e4c73a6d7a1

Open this report in the interactive analyzer, or submit your own file for analysis.