Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6ac59784f454d7…

MALICIOUS

PDF

91.0 KB Created: 2021-06-10 12:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aa206010a3a8e5ad5af97635024ebfed SHA-1: 7349b82eeacf6b69212e1f578608fbaf474b1bff SHA-256: 0f6ac59784f454d7f134a2aa425269ce790efd8a9f97efef8bc845564675e79b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The embedded content, though heavily obfuscated, appears to be related to JavaScript execution, likely intended to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=mahi+mainu+chadyo+na+mp3+song+download PDF link annotation
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078000c533ed---69355486748.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ecdfb6d0e---29441110416.pdfIn PDF document text
    • http://jarosi.hu/files/file/tuvuporesaji.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/96e85b3a3e2027339f33cd691fe9bb2f/xomuwowa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8lubeu9o2hatjctuk730svgi71/27370160029.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/29425230266.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3ec062765b9f425928fc57588f0e08b9/guzowowedixole.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0ebd87b7d0297e670bb57f6f3e59d3e9/femojatokewixuva.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d8e79f3840144ce12b51f97db6c67c5a/vapixilimurivif.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pu7ntdnm62mmo9218i8uhtgh2c/47435906901.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1370c508490f24d8eb10eb21bab42ba7/33657777296.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607e837b98a04---rukulakodoxiwefun.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1410929c8---30329937622.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9b830c16cc1005deb7d2d37789eeb239/65161370127.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/2a6ns6ukesf9auqrj0fblgcqgb/zazovoximafelosel.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1ca35e68c877e6a60654285c08552730/70890559310.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tefifunavi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/marasupubolif.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720054580c8---19719180363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 2908 bytes
SHA-256: 5cb3975271b489f8872ca4ebe0519fa5bd165d658d4198eeb3a8599bf371c92e
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 5436 bytes
SHA-256: 93004c0628e20406697b27562692aa18441e1b29a051b983654961373af40c8e
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 11980 bytes
SHA-256: 59bd3beea4c8dd3da14706ed61b86e04459618442be81e09e4c054c3d635e67c
font_03_sfnt_off000139dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DD 16340 bytes
SHA-256: 54979be640f676cbfec15c3b3ce5f9647e71b5503831261e22a5f5420bcc87f7
font_04_sfnt_off00014fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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