Malicious PDF — malware analysis report

Static analysis result for SHA-256 0786d9ffde4c87c9…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 22:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 446d0e7a07d3bd8e7b44f20701352894 SHA-1: 26c536087662be858cfb2848112e87eed9a20b2c SHA-256: 0786d9ffde4c87c9a1f6d88c8e06a40272011ff555d531cd4759019e190ce7a9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd7f2cebb0---sitirujunape.pdf In PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/lilunanovu.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/bamijipoboga.pdfIn PDF document text
    • http://bkmjg.com/images/upload/File/rukugajopawenakupesesi.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/42054936289.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/dotugimapemeke.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/fopafokesetopoxemojekidi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9tssoq0n4ic6cbqbgsd2e8f5q4/daxipakajamadumakajozepi.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/36659526287.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/ripefixiguramitenigab.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba768620b---tivedupubopulonera.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/cje4l34taorpmu21jqbluhn7ko/maxowasijuz.pdfIn PDF document text
    • http://healthywithhart.com/res/file/tetala.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/memiwa.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/razagevuzezogugotu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/39450f45c0a11fc648424a68e6e97bb4/66475886477.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707b689f16e---16141875091.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/25acb3c9a187f041254374696b74dba7/38798166224.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6cjfuprobo909ldpurngeimhp2/xumexovipererif.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/sagajodasep.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/89471671057.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/97812445090.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/tuporanizizukunogaxas.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d98c5262aaba2dacc3e606998ef67809/37478416291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+limestone+in+doodle+godPDF 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_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 10660 bytes
SHA-256: 50d2ec0ca2ae4ed3c513372a765f3085128d2d8558b4bc4e6dfbcd04579eda85
font_01_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 19300 bytes
SHA-256: 7fbefa6d27d7eb61379d08a8f819905348805262d71cf2c9ed63bc6efc69ee58
font_02_sfnt_off000158bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1