Malicious PDF — malware analysis report

Static analysis result for SHA-256 81da82a214b9b289…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 02:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e07d34edbdb06ea30a75fa13c70abded SHA-1: f25e61179dc3098ce270f5c703303d88a6077ee6 SHA-256: 81da82a214b9b2890dd7cb659a23e6bcae0add034de1f5baa35ec0d0e49abdd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://miass.realxenon.ru/uploads/files/37148954572.pdf In PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd0d4a4ad---37012419012.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e717da4c45bd96be014df9dd99762739/zuwemelitogumul.pdfIn PDF document text
    • http://ndt-ultratech.com/files/gutatazesoleviti.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/gonibubef.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/pomizetam.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/zulejawusemitatas.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/524mhjnplk09mnnh9o82pcctlb/80688882505.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/37582424490.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/35612680713.pdfIn PDF document text
    • http://katachizu.com/img/news/files/sopuzunavape.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109050311597921.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139770b7f60c---sasivib.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136029bb8c95---xogofe.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613819ed66559---65140676553.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a960998a42a2afec49632a8e0406b15c/14616524391.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/95391198169.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/41955925711.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/80409234187.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/temuwos.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/mirazusopok.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/21322221766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=phum+dictionary+khmerPDF 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_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 10728 bytes
SHA-256: cdc04fbd582526a0b7cbeb63e819e84ee98bf90f9a67cec6815c605044f9e0d1
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 19588 bytes
SHA-256: be9205bf592bef08e03db3e41e908cd0cfd47ff6164aa7b475a6ed7a4d8e511f
font_02_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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