Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e6c3f074c30492…

MALICIOUS

PDF

90.4 KB Created: 2021-08-14 06:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: daa0c87381d9714bf2816cfcb607d8dc SHA-1: 4e2053a5f3fe2605d9ffb09d32a6e5779c9b751b SHA-256: 22e6c3f074c304927e36a50918aebb4c92f19843ab42162a62e234597c7b5ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://eltonltd.ru/sites/default/files/uploads/kobopogakelamerosefusili.pdf In PDF document text
    • http://bischofs-scheune.de/userfiles/file/tuzifevajirisos.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8b72dc4b9af103d2806610e28e303447/41387707596.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3aa8c752550f743f9d1eca6beee99c46/nirativilazajekumegodif.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/22702607996.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tosuzesikopejukalav.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/28bae53463dd182ff430042656451094/97678602648.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-05/images/files/zudatorobulikinifidegugi.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/nuxidijufi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67128f22e5---mikipaxata.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/bekikumijijago.pdfIn PDF document text
    • http://roocenter.ru/upload/file/lapawojewozotuwunez.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a495d9279b2---46381415621.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/73054b263a30723b6410fd075e711134/47386334719.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nlac6jlqbmnde21208pt034cg0/tuxipanikijof.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/885e1cf874ca0acadd9dc4598a6400a0/44274599905.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/siwanigesuzekaseg.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f3e183f5b---kefinabefadige.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/13716529595.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/navofapamiwam.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160774cb716137---balorowofetimapo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/sijpr5f21ufrofpdhkfcf7aa2d/kevimijamolizelagokup.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/47150127875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mp3dx+musica+gratis+para+escuchar+y+descargar+genteflowPDF 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_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 17876 bytes
SHA-256: 071d59edca4176c35cfa8f9105b3bc6a1da0456b8751a326d35e13d24e22f503
font_01_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC8 11636 bytes
SHA-256: c3736fcaa18372fc31e7ae6a3510287964e33e9d2640acd307c9b4919aac425a

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