Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a71947895e7dd73…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 11:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b517ea6b12840857884e707101746b86 SHA-1: 28bf91b92cd35d9966c6e9eb713d61e8a8eef819 SHA-256: 0a71947895e7dd734e6cbd9ea7ea94495846eb932eb717246530d9aa16a0d35c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm used to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aihr-iadh.org/uploads/FCK_files/file/27055808751.pdf In PDF document text
    • http://blankheich.de/images/uploads/file/dubaxukiwurukote.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/967bc68cda4c688a4851d451c932665b/69456044563.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/lujajaxemu.pdfIn PDF document text
    • https://andhimazhai.com/images/files/lazazefida.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f38d5dbea2---50306288017.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/15643263729.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/lugojisamojaxikow.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/59305135323.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/40ecb9052a84c30081254fe9e07422f4/tunodosuvalesidu.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/gemopijugeromuzafigumis.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a686003c18---dunefenogubovexux.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/semirojukapefomudu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4g2ecmeclr0hjb1ci8hvm1q9f5/21908593866.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/80719095316.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/31036784510.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/27836eedf8a25d2e0ad87aa4cc55e5bc/21628682691.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161305e2421f4b---29440745871.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210913100155026.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/65dee292edb5a1f7d57ff24a618347c3/24542822608.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/puwuxokenebapej.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/42560190744.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/29415299832.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/fuzojage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=react+native+emulator+setupPDF 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_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 17728 bytes
SHA-256: 16e5aceb4a778374d4a84e8353ed8ccdf2cc21594d4370fa11bc6e782cbe1864
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 10744 bytes
SHA-256: 1c82d50438b7cd2c391a5f89fbf27489f8d86ffc66b963a33db33f0c23e85ac1