Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8241fdecf62e16e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 23:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b11b5e5cb942264558acbdc0f5a0e126 SHA-1: a7adec403bd7a159bd4f81ae724d1339073876ab SHA-256: d8241fdecf62e16ed8155b7380f78a7ac040e9f4af04fd56248c14ff9bdf848f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://metabolizmusonline.hu/images/upload/file/wijolosopab.pdf In PDF document text
    • http://goref.ru/files/file/jivovasasutapevajuniw.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/sasimitaxobodokil.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/tuselebijafo.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ddvqmftsg9jbkg80sdrhvpljso/95952428935.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/rudowoluvixatumegobovufo.pdfIn PDF document text
    • http://budropol.de/Upload/file/jifugegotewolukumese.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/memilodiwi.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/xotajegasawim.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/lotomefenidosuboso.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/67477116646.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/gelibo.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/99647033622.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/tk0kn35b6nbkks470thm3adqh1/12554102505.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/berixubemilibigof.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906113518.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/fajawotilo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/59662f441b61645a2ebe2be9ad7f0e22/94537569767.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/32425225330.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/19829310000.pdfIn PDF document text
    • http://www.pvvc.cz/files/69352294908.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/relaba.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/muxag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dark+sky+app+androidPDF 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_off0000b1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C6 15688 bytes
SHA-256: 87202979a8caabc39528b5d023718d36cab54d00ce7cf4b4c2fa44300517cc18
font_01_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10316 bytes
SHA-256: 356508b94843c87ff08173d75bad92f77afae04352d3035cffca00276a61d93e