Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d6ef3e63f12834…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 20:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbba59f457db469b26ac673388a0fd62 SHA-1: 9485d44e5eb4dfb202e9a8b2eaccb4c8afa81326 SHA-256: 50d6ef3e63f12834d4790f92ada962a432c020b148aea45757d4fa2a2ca31c41
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=caller+app+for+android PDF link annotation
    • https://khabul.mn/mmpa/userfiles/files/28691851372.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/sonevatuvu.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091311032473499.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/vufiva.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/pulozodakaba.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ade8c807b9175f9af48d9a1daf65de4f/jilenedujerefaraforewiz.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/251847077.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/defevisabixixuwefum.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/nokapewa.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/fezegamuvisuve.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bebuwekajifa.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/dekenilefogumifana.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7c9c7ac633208057d07e7e43bb08ab21/legibiw.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210907184825_2078198845.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/88014244091.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e9d124c5---wugawuw.pdfIn PDF document text
    • https://ratodua.com/contents/files/jotiwigevuremupuvadusowud.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/14768783706.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/54372045186.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/parutodoralaw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136efc83a0b2---6356201615.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://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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 10256 bytes
SHA-256: 087b0e79b354dfc97bb0a3989954d905882f54da48d94162a7c869be954bdb52
font_02_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 20984 bytes
SHA-256: dc43a51b2b12e3e494f17fd6651d773e556201c75c291ef211781803e6f32310