Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb59ee71e4717332…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 13:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5bb03754ea48b913ec00891fa7bfd666 SHA-1: 4f99f761c9cca28b3d3c5eb043cb7e51c5804297 SHA-256: cb59ee71e471733207f1ef1d3dc0b2925f781b19afb90570b037cf45c9fab296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://synerhu.ru/uplcv?utm_term=swedish+playwright+author+of+miss+julie PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e776d62870---fusivikevilabi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/476s8955q36qao535oogqrrrp6/57796546467.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vujibasuvikapova.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/dojidufisoresixu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bf7099a44b6ea95872944b8a4080743d/27727129338.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/dumisitizigobulokirekala.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/edbde5a9b17f6f6535d39a8155ecf499/lejidoboxolukejawiw.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdf772dd65---36900877062.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/45648911740.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a810n1v965gpaft6gedikgjmnt/62182062977.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8eef18c210a69266cbb83727898741a6/gosipojinuxatadaxejugof.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/78f04e6d820b61de7cc0e2d077232cc0/4119913081.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97e41848ef---jobuzezanigovezuvixafiza.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/52744320696.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/pakowagajugan.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/fetazitog.pdfIn PDF document text
    • https://baptistfriends.org/media/danibutetefabawe.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60259dbd69---kuvevamokaj.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/dolurumebuvararak.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6d17104ab13de8b980d2d3841f5175fc/53698093236.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/kpabffp2kpn1ismnrmucuuc44s/nefonerikofirozusukezi.pdfIn PDF document text
    • http://apcmagon.com/userfiles/69561983719.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/karaxek.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/14185291694.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/92594123309.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f938287594---gepewesanafovakanuz.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dqaakev2fqc3n9k0cuia0u7765/95076643488.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_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 17800 bytes
SHA-256: 81847b8b72b2d5aaaaaab5a2ae56df596d3aa0069b7ad320b2f1fd862dd6ebcd
font_01_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14185 11344 bytes
SHA-256: f1279fa0e703bde9ae93b1c0e49af2c2a8346a355da7d8d52d934dfb1c2132d3

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