Malicious PDF — malware analysis report

Static analysis result for SHA-256 2898fb13af358a00…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 08:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8c2482c2123c35551051b8dc2ce51bb SHA-1: 1036e38f6dd4f8bf665a5176037160caa4f9804b SHA-256: 2898fb13af358a00b9b0a954d713e03b6d2f07cdf76fb1b496eb0aa7d717eb5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure, specifically an invoice or payment scam. It contains numerous links to external PDF files hosted on compromised or disposable domains, suggesting it acts as a gateway to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect users to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/17b7bf9cfe65a4ead66f4afd96a614e0/57671573481.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087711ab74f7---malukudunipoferel.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/bexepa.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210818_4B4B00760F361431.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2fab38205---61245257331.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/263d3579f5affffa1f46e2d9ea0398e4/52533037947.pdfIn PDF document text
    • http://www.celso.org/download/12060169981.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/rofurunap.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0ff2f2dc---vewotadafuxupudilanil.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/lebuzepupoxupus.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052509001397.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb8b9dee880e1c3a7037a0d7ff7f5800/rideje.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9abcde225---60849858610.pdfIn PDF document text
    • http://lblussana.it/images/file/nosajujabimepidim.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/99323595268.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3472fe27f5f9c44dd5b65a575cfa8f23/zisaxisirorabonumozurig.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/36128197038.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/25674572913.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/69356032221.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7773bdbed4---16742928545.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35f3bd5ee---lejoxevutones.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607447f7ddb7b---xufopebuwovojekodawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manual+hand+pump+for+oilPDF 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_off0000c0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BC 16976 bytes
SHA-256: 4f618bc204b9d404c933418f30cdfe13e4905f05ad587d7af7a2be1c89d90ed7
font_01_sfnt_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 10456 bytes
SHA-256: 804c5107b88faee5cde1e3eeea344bc29f02a8eb47f410ae645c4465388e2104
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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