Malicious PDF — malware analysis report

Static analysis result for SHA-256 da41fe9ebf540238…

MALICIOUS

PDF

72.3 KB Created: 2021-09-10 09:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ca39d4a78b21caeb4319b3bca279b53 SHA-1: aff77dcd6fdd87e47d59aeb517b01d84a66e4c60 SHA-256: da41fe9ebf540238774b845627a1b7cf1776bd02998220ae706ecedb95d4ccd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aspirans.com/files/file/26708404085.pdf In PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/tenotinavirabozejenuzegi.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/zeditejurebusekexobakaj.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/29335916373.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/87479328577.pdfIn PDF document text
    • http://chromavials.com/d/files/vulugomikamasiripiwubij.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f5f419c740cab0d82770a943a53aa852/vomuwobisujenijov.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/25150284473.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090710155780554.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/22338996552.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7ad28b502ce05c5dbe8fdf0ea9e3e365/zesopanodoninetew.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/44482724665.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/tuxilurodefiwibinokefim.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/30756803183.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/lameditepuvafizifo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/1521438243.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/zogovapifegusazira.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613796e5cccf2---vigujepoxebi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/39805676543.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e672bdfb6---86149258583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=is+cell+wall+a+prokaryotic+or+eukaryoticPDF 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_off0000ba69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 10604 bytes
SHA-256: 0dff5fe3e1004ce9e4af875117c8a3585af4e16a1ae70e98e3565015aca94cab
font_02_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 15848 bytes
SHA-256: 3be972d41deabd495732044fb008482924d86d5df45fca058d45d3faf4ae46a3