Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a63622f68e424e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 19:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf6992e1a340cf5bc932f42b04359854 SHA-1: db74eec7e495f0464ef31cf03f284e07a6d8efd6 SHA-256: 34a63622f68e424e782d969c8757d6cc16971a06c83d1d1582351ac87605fb50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'downloader apk' UTM term in one URL indicates a lure for potentially malicious software. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=y+mate+downloader+apk PDF link annotation
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/15986590591a7446a657e373a0be2009/lizinobog.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/82608983477.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/35223356283.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/jitolidanedabelipis.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f4ab05f2cb6a2da492d190801617c7a0/vumikojufomejosapi.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/37062025611.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210913_120214.pdfIn PDF document text
    • https://gornjastubica.hr/files/zuburizejexakupazuwe.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/xererovojagoxasolavarize.pdfIn PDF document text
    • https://tcremich.lu/files/files/89616685563.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/82535594244.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/forijedavexe.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210901185316.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614532d02010e---13614697460.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/58470444769.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/15140759966.pdfIn PDF document text
    • http://recrute.fr/files/files/laponesajus.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/90836190424.pdfIn PDF document text
    • http://kaies.net/upfiles/2109112308148272002hbx4g.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/12850222781.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/28294710847.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/42960149754.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/37145425043.pdfIn PDF document text
    • http://boldogelet.hu/media/86644082055.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_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 17488 bytes
SHA-256: f679a5d74c03c23a2d01697c71bfa304470eadab7d16239ff49b8d17dfbbf018
font_02_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 10452 bytes
SHA-256: 7e68abf48af988407d11dafba83c35ec01d658c967e69026b3a97fe8adc19739