Malicious PDF — malware analysis report

Static analysis result for SHA-256 708b3ff619589b86…

MALICIOUS

PDF

84.3 KB Created: 2021-07-29 17:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d32956a7e975d3272c87d067cf77a447 SHA-1: e8f3bf8b9307d778a83036a6df5b9a5a1fe4264a SHA-256: 708b3ff619589b868d3e1884319ca524b5d2a5f6ce94aa00148025b7fb44ee88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9ffe596c---68620277261.pdf In PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/rubesuralimakuvaf.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/gosulajokup.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/60525159766.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6da773550148ebbe6c7939d8d30c9441/85662352148.pdfIn PDF document text
    • http://sam-global.ch/files/file/wipedolemegosenunipon.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xitiwazoxozurexuxubajomet.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712e4fb33d0---87275238879.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/19135890936.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/fibirafefafurexafo.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/gemed.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bu0ar9igmfiiehcu98ghpchr0h/gavixufitu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/767b0e56e62bc2f82ae3b0d810461016/52629742554.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/pifojaseriwugasobusi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a38505bf541b080b957a762e0e98c089/55665301196.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kunadezoxobanonobapibu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a23916d5c45fad9e817524cac1c482a7/57824289531.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34ae0d304---16399030657.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/aa709610237d56d851e92f5eb137d742/29468158414.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e00064d9bbc5dacfcaafafa9005391c3/81222686638.pdfIn PDF document text
    • http://dges.in/userfiles/file/pesogekazomexejabewirimo.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xijalunexidifuxovogevojib.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8feea583e---82840401207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=medal+of+honor+warfighter+t%C3%BCrk%C3%A7e+yama+indir+gezginlerPDF 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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 11368 bytes
SHA-256: 9d282b1f5a485ec7e1f2559639a3b21e243d8ae49d20b2001a689a0ba8484c36
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 20072 bytes
SHA-256: 544ee43a7d21bdafd1da45f235047cb9afed0496dca337e94f81f298cad62658

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