Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed3508b005e898d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 06:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e792dd03ec540a800d2e20c1fc2b8ac SHA-1: 16f1432cb57f6c31d7596f62957257404a92009e SHA-256: 5ed3508b005e898ddfee0e2950194d2d928320c03b8f2dae83d32e1e9c248557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=words+that+start+with+d+and+end+with+l PDF link annotation
    • http://riverla.vn/uploads/userfiles/file/88554667041.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/lexadefajozurevox.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/faterukarorasod.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4a07866c---60779497172.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/37703254267.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/vibetuwawebaxanolexafos.pdfIn PDF document text
    • https://blogsma.com/files/88740371792.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/kozunimevijaxolowamove.pdfIn PDF document text
    • http://poliinc.com/upload/files/kejemurubiwitikenenuwus.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/podasi.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82070660647.pdfIn PDF document text
    • https://sambelteri.com/contents/files/takoliluwirazuwozita.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/39756693141.pdfIn PDF document text
    • https://hirurgija.me/files/zelajaxesozumuvivodivaza.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/xaronibiruralejexilefufan.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/57960114432.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/mazusibofofex.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad9546a4ee---91168307655.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/xudugusu.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nufovelat.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/fudabizota.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/taxipadojosefon.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16151877962fb9---dazirekugifusuma.pdfIn PDF document text
    • http://onlinevay.com/upload/files/60264624404.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_off0000b354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 10424 bytes
SHA-256: 2f9f1dc0d64bfc676e3dabb9c3683ab8e91e7a0fe5afe806a78a0cd17f7cf9af
font_01_sfnt_off0000caef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEF 16724 bytes
SHA-256: 73943458619c96eb90090f69f62473457099bb135a0ce4d2c4243167bc17cc4e
font_02_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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