Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0315bb474b39fdb…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 13:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e8cea67253fb68611aa649771bd0f8a SHA-1: 5f9ab71700cd660ea3b96f4125af70fcf44c4a7b SHA-256: b0315bb474b39fdb8e1e9a6b612ed16936064d9ef1bb4eb55982bb79afbd17d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggest a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to distribute or phish via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=600+square+feet+house+design+3d PDF link annotation
    • http://congtyvima.com/images/Download/8367081888.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/71398858142.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/i8urs2nai7vg420sn6srimlcem/mijelakevapusuze.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/55832779054.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/dijaxasumag.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/beretumile.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/repelujigunosomof.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/98828220435.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fometokivepebozoxut.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/fimudebinelaril.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e76e2e075---98587465458.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/11046664603.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/47083304786.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t9tg0oof9hrdgkt9re4u81ssj3/54243533101.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/vizovukotikekizogujowugu.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/lawivuvemezaneno.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/kudexisojewikadovosoner.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/26629303170.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/norenopeteliwofukikuna.pdfIn PDF document text
    • http://topstec.com/d/files/masuxaxasijosavesatalok.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/logupezawinovokesa.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wituriwopexorek.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/porar.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_off0000b1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CB 16076 bytes
SHA-256: 21ea4dbbdd628ed132571187ef6bc26b3ea5692ddf89c13684cf7ac1fab69a9c
font_01_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 11196 bytes
SHA-256: f8a02f04b1e224cdad3e7086174f93534876131460ea029dc9cf18209e86168b