Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb07d33212c7f16c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 05:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e0e0a192e18dc643f481e39469db235 SHA-1: 44e4ae5e50c7d8427cb140ab0edac4af84516fcd SHA-256: bb07d33212c7f16cb40fbb392835408ede67645001fcd2ca7c55050e0e93777d
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to host malicious content. A 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c591e2149---xesikepikude.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c7f64952b1185cb68167199d243171e1/59171614292.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/jonitawimazew.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/lipalazimujofezewejew.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/rexitetakoxodufuwagiz.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/xogixilerewetujagabamasof.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/66726712977.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/vinefarofa.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/temuwegogixeloze.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/xenexexedelow.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/40399305953.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/tagimalukusudatiwokuxovif.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zapanabolefego.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/pelarirapatefewutasebol.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/kitetuxiridogalejadesit.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/51309772117.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_010024.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/nosazuxoniv.pdfIn PDF document text
    • http://bronia.org/userfiles/file/47700075758.pdfIn PDF document text
    • https://angkalaris.com/contents/files/48279311940.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/27466846916.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/66393506980.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/powovifubawinonunu.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/gapufezenexipepal.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/46692032778.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4eb557c2---valojiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=obb+dream+league+soccer+2016PDF 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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 18496 bytes
SHA-256: c1caf0aff2fe58bd38e1f9f1d2b0063bedc40f425df7fe27dfc6355fbf789e89
font_01_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 11144 bytes
SHA-256: 8b1a4b9d321421520bebe6b448e13b0979b0f68cd5636a1b5e0a214c69b1db7d
font_02_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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