Malicious PDF — malware analysis report

Static analysis result for SHA-256 43164f18f7243a30…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 02:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff251ad159acfa6f0e11d8cb4e503f9f SHA-1: 91449f40224e9619143b287339c1b58693291ad4 SHA-256: 43164f18f7243a30ce34f4b4ffdff9051276ecb1d06a064ce202e1e3289e169f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=how+to+hack+real+football PDF link annotation
    • http://hueide.com/upload/files/60007141173.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/32337107404.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1ac191137---75825234388.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/14edff695af076e11f9328adc14dd6ef/55456053360.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/norivi.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/5502128570.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/38188199267.pdfIn PDF document text
    • http://fxlcd.com/upload/file/25710025662.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/kizejexi.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mejitakomasijogobobexige.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/40798228765.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/31422652795.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/robuwesemo.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/54276562645.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/68745484882.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/43491488297.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/tafuwojixalebuzagakos.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/87380991903.pdfIn PDF document text
    • https://digireg.nu/upload/18239999068.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/dixuke.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/32950642397.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/rajafawumexewusexoximi.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xawaxoturowojalaw.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1403_20210910193246.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613341b0b9a8b---47435269741.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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 10376 bytes
SHA-256: d7e1a8e3bbc2d647acb86e9dba536d938bf119294ffeb99ae7c049dc3b91a5be
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 17040 bytes
SHA-256: 79cd09427e6000235f50682fc3a99ac0a6f9b9d25bb85babb5616767b5a0f405
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1