Malicious PDF — malware analysis report

Static analysis result for SHA-256 53002012bdbd8e40…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 04:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47f2cc6d7cfe4ff500d83ef8958c4455 SHA-1: ddb3b0d5047f5e5b8752bf4a88541f4afb8a1148 SHA-256: 53002012bdbd8e403f293f687c9790ae0155158c9469b0f5e00cf21ece506160
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many of which are hosted on disposable or compromised domains, suggesting a link farm designed to lure users to potentially malicious content. The presence of 'utm_term=convert+pdf+to+msg+format' in one URL indicates a potential phishing lure related to file conversion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://iuoshili.com/upload/users/files/jifajitajosug.pdf In PDF document text
    • https://onecre.com/images/content/files/guburasepef.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/banuselewojozogivi.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/60846099732.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/19356179089.pdfIn PDF document text
    • http://hrudolf.com/userfiles/76356908654.pdfIn PDF document text
    • http://www.siposferenc.hu/html/senugepabodi.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/16967691840.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/tupejunezulawuloxitukiw.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/powidixolixumabuni.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/85057763189.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f647392252---50343884437.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/lawijesabitafitifajunedos.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/fotenabusegofakejetizu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139028126e00---41050069734.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/tigawazovobapadi.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rekelupekemelaravov.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/buladofunijorofolokil.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/fawaribojidekuxomowowilo.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/19033189716.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135db28023f2---15592360183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=convert+pdf+to+msg+formatPDF 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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 10800 bytes
SHA-256: 1e073cccc1f95d9cfb2559a81475e5c6c81be2a61e6d91237fe45afd4a32866d
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 17384 bytes
SHA-256: 8714b44c809efac912ee854c281e7e87f39968f86050f549ac55f1c4447801e8
font_02_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1