Malicious PDF — malware analysis report

Static analysis result for SHA-256 a933bc584d0755f7…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 05:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef2d398546458b429555adeea34c79d2 SHA-1: 7f0beccc66bd5f65e3486f068511ad996dc41b22 SHA-256: a933bc584d0755f71945ad032e4910af3b9b2285f5d0ae8cceb4052d3f85575a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://heizler.hu/files/file/73728021198.pdf In PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/joveliwikasamixi.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/farurexol.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139c108e2498---27613344286.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/topefow.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xefoduline.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/tijekojibilodexi.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/38488153568.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/kuwitaxodizawirudejulepod.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/59376786390.pdfIn PDF document text
    • https://emenu.hu/editor_up/suvunifepawoxinofo.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/41111043771.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/kotigasiwobop.pdfIn PDF document text
    • https://5udua.com/contents/files/6948724674.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff3e103e7---dawawawaxekopavevaleloxib.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/58207751645.pdfIn PDF document text
    • http://12shio5.com/contents/files/voweledol.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/wonoforilabebureti.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/jusijemomejepowapok.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/fibuzagawinepofenosaganiv.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/59647185335.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/49841828006.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e0f1c9f8---45433841253.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/muwewebodeko.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/pikor.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/safaguwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=clash+of+clans+hack+99999999+2021+downloadPDF 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_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 10824 bytes
SHA-256: 92541b0be23dbbf99105acdde51530f7e14a5c0c8a0f59cba1092e248efe01e6
font_01_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 17296 bytes
SHA-256: 015815c10e2d8cab115ec3e17b536f3be7377520401ea9c4724e48c2270bd27c
font_02_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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