Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ae3f9eaa765d12…

MALICIOUS

PDF

87.2 KB Created: 2021-08-03 23:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4af1bf5eb59b1731f1df450e297319ac SHA-1: 29d3d1c1e04b708234e32f0031a0bb88ae5af842 SHA-256: b8ae3f9eaa765d120da41529d6e17f910c648f2e6cc20805f89c09cb0382872f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO abuse. Although no scripts were directly extracted, the structure and URL patterns align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/b6d96b8vkm31ntukan38978q6l/98041588705.pdf In PDF document text
    • https://syntellect.ru/Repository/file/48317603412.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hu8otu3dkqapla9i9sfqhb9apn/42436245204.pdfIn PDF document text
    • http://humanlitech.com/files/files/10221435738.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/87558303662.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/18529919652.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tabuwavaf.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16091bb225bc27---jorikupexafofigitominit.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/aa93f90dd83fcf2fcfd7469584d7aca8/87169736436.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/sowemivado.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2d79c67a3b124eece630478762aa1ffb/vevelumowatitinoru.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/26269008110.pdfIn PDF document text
    • https://activepymes.com/pub/file/59779892056.pdfIn PDF document text
    • http://iwishop.hu/file/sikajetinadowutep.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/senosakabapobuvutixopew.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/22017053795.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/27136903815.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210607045258309.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/gaxinelakanozujurasaviwo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609730c931110---35732964329.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0c93ccc5bde0478060846a09afa27487/dolawad.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/38874730657.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/59642248193.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/2132531312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+guided+reading+level+s+meanPDF 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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 16724 bytes
SHA-256: 7d3144e47c1a7c1ff5e7e11f1f9076d667c4c98b33a9aa71b2f368fc4e1b44da
font_01_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 10732 bytes
SHA-256: c9fb2a00b6b9d40f6a42fbf45272da583dc4028b150213fe86454e6e1443813e