Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52669cfadf7c4d5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 11:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2086d0a7e3f308c2cee2f871bca174db SHA-1: e9924dab22361285519c175958a7714ef57d66e8 SHA-256: b52669cfadf7c4d5bc25577d41ecffedb2e440638df573bab2f28110a5628e3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious or phishing content, as indicated by the embedded URLs and the 'link farm' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=android+studio+change+app+name+and+icon PDF link annotation
    • http://kaitosushisb.com/uploads/files/rujupobumenote.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5ea2b8646ae7cfc32367ac908e0c6081/tixiperujuwiropivo.pdfIn PDF document text
    • https://birotex.rs/images/files/mubejerefotivela.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/60930124485.pdfIn PDF document text
    • https://trystsalonri.com/images/file/88247693659.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/15406573486.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1c5c22e16feefe738c17fd27e073f12f/dulakadu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409d7c65225---metog.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210916_054735.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/25062065503.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/73308488010.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e9d69daa---56359752701.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lafufebube.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/15843750816.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/vinupubafape.pdfIn PDF document text
    • https://wsbtitan.com/images/file/14980769961.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tepasivegowalevoboxu.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/39853206094.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/zejijunozan.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e8fd76c503a27ca02292145477cac4e5/fubusovumed.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210913_D19A9F3BD9D72E7F.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/51242494407.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/40996909482.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/rajux.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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 10996 bytes
SHA-256: e9542afeb76d128e1c25bca808a174e7850f1e728674d6626d47be897345ddd0
font_01_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 17432 bytes
SHA-256: a6bf535603664047eb89973ef9697d5fdf8df5428e1bbadff23905ddcf4023d5
font_02_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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