Malicious PDF — malware analysis report

Static analysis result for SHA-256 61705cac09aea92e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 07:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a0536eafc0cb63af40ccaf27783c917 SHA-1: 2d54bd744953ae567aec6741aabc0ce3a4a177de SHA-256: 61705cac09aea92e9c027c8b0f3a84e3e819786c054f5e671a37f4a5f0a4367a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=subtraction+with+regrouping+word+problems+worksheets PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88fd45cd5---3738580525.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/pamapafepilugawukigoxape.pdfIn PDF document text
    • http://ciskmv.com/css/file/14152114145.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/13225003311.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/jezomeva.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/95393618144.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/burixuwex.pdfIn PDF document text
    • https://luminex.pl/upload/file/25519505614.pdfIn PDF document text
    • http://anpo.vn/upload/files/15448468316.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/26178961205.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/109914e867c615e6682fe9b59758adc6/gujopawawanegatuz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f74c263471405ad40fafabccf17e6cbd/8741313059.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021082114292473499.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/vorazapibojomunojixazo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/59363831468.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kedagepelifisitejebepude.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/lozebitifanom.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00109966e---51539044116.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/10357975411.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/83c3a23d82c3dcc3386dc891ec7d9d77/61102245807.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/204307c1541934bcc3c1f98020117bca/vubasotamogej.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996e780e3d2---zuxesa.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/dc3f0fe8d1696280e4dcccc046790654/desuridojexobukavuku.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c249ea93cdf---11380980443.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_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 17644 bytes
SHA-256: b3e4f1eec3d5d5ede99d67f814f8fd0042805cf0338099f75ec8fbd8250ed50b
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 11456 bytes
SHA-256: 13b59349ad4e4140305b7683ca999720f186ccf9cf674f5146d32b4be096b569
font_02_sfnt_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.