Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5894587c579e863…

MALICIOUS

PDF

85.3 KB Created: 2021-08-22 06:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bee7bdb759ff868cec012aa3a1a62c7a SHA-1: 80f7653c3f1dc1d2181c8ec0b98c34292e5ccca6 SHA-256: b5894587c579e8633dc0837e90a7b2850725008e9c2116e3a163fd8b6bb45242
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and a link farm structure suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide clear textual content, reinforcing the malicious nature indicated by the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=go+math+grade+8+answer+key+page+104 PDF link annotation
    • https://przyklejki.pl/userfiles/dozaxinodapalusepavunadox.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/91757613274.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/firenavizodesalijoposi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27de777e60---rakuturofarixusewegazo.pdfIn PDF document text
    • http://polletnv.be/uploads/files/55600859390.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6bbc401c---lijojoruzotane.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/6b5k4bqemdhu560mtalv2tputb/nuviwako.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/88962779391.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jleh0cv4snh3kcqfj60efcgv1h/9714350128.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/guxelab.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/65251933552.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/reribawejamaludusekemo.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/71855189016.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46ecf2f10---silig.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/46921681804.pdfIn PDF document text
    • https://medius.sk/userfiles/file/wuvibekedexarupikaga.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/tadoledikamujedikipeduji.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/lufelodufa.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/506808bd8a449605927b303375a81459/6147155571.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/63267523568.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/67859092345.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1b42d236---gelekonebabuz.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2220f6882f---68691406560.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16115928c2354c---58272982090.pdfIn PDF document text
    • https://bloomeng.com/uploads/89478200104.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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 11492 bytes
SHA-256: 5b0229f15ef43b4c9d5f30bb91d4dd7d3d99378cf7b90df92c2e546237c9b2cc
font_01_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 17428 bytes
SHA-256: 72523b1f75129c6237f864119479b1c3f503c22aa5231d499f359fcd39438abb
font_02_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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