Malicious PDF — malware analysis report

Static analysis result for SHA-256 5137b8353f45337a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 20:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 05a9e1f90bf923ae194b7316041fb094 SHA-1: bf1f102ad85122750743bedb950ac26f6d7fe3bc SHA-256: 5137b8353f45337a9b6c266386f698e97767a742a2b179c103d02d693f855acc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stijsr.com/userfiles/file/tuginixetoro.pdf In PDF document text
    • https://drhuanghair.com/uploads/files/202109071217186481.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/matigixagagep.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/venadovipifetilin.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/69169749132.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abaabcc42f---xenulumolabez.pdfIn PDF document text
    • https://successalpha.team/upload/files/1071207115.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/mopotutibu.pdfIn PDF document text
    • http://abnicum.com/files/file/563313442.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/uuoghhrahli1hskna4te5t2s7m/97063379407.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/37094304942.pdfIn PDF document text
    • https://xaydungkienthiet.com/upload/files/xuwuzigekanetezetonaj.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/kazanulixorigitila.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/70668016270.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/63235354148.pdfIn PDF document text
    • http://elitk.ru/_files/depiwizasexifinimufe.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/zagigex.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gulebipedutodalom.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210929161755.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/56248739652.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6de995e0---29169990170.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154131f4cc3a---nezitepa.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d69cbd38ce---larofudabarubenejezemotil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=volume+in+the+real+world+worksheet+answersPDF 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_off0000af14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF14 16032 bytes
SHA-256: 90afcfe8fe3ab3832720885d12b023c6c6831a4556ca6b24b3423a18d45fbdf7
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10760 bytes
SHA-256: cd61d72cef454a7a1bfba4b2f7e1d07a699b0bb7e06f7e98f95eeec3d057b639

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