Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eaa23719b18ba81…

MALICIOUS

PDF

77.3 KB Created: 2021-09-24 05:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9fae01a332480931f24e082ad8a83b2 SHA-1: 39aed61c4648c824cd23e18743425e1e276eb067 SHA-256: 3eaa23719b18ba810c3ba257c3a24088983a93e9c806a3d88e2c6c775ed8185f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=masked+forces+hacked PDF link annotation
    • http://belovosushi.ru/files/fekisex.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/82953904224.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/eb165d55cf39e6f4928890e618961385/sedijoja.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/78620735419.pdfIn PDF document text
    • https://brakos.it/file/39714855726.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/livapujane.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/92856864404.pdfIn PDF document text
    • https://raljob.com/userfiles/file/59014097487.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210918134323.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/47628856999.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-24/20210924085339537841.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/83613422458.pdfIn PDF document text
    • http://sns.hu/_user/file/80055790241.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wupefipifebusipekujirome.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d06df047---bilimi.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/mozutipejugaxenexavi.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/gukoriluzitewojurolobarov.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/fatezaledugake.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/97955769055.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/15845911308.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9d623242378f71f8517b3fcba6c677cf/83233820004.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/sutelezisarerevum.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_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 17320 bytes
SHA-256: 7200a212b60f0b36490ad5bce46aad6d4bee497903c9470d9d416e3b2335d7f2
font_02_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 10316 bytes
SHA-256: 38f1a56b79990b6fe7d9f818a58e482bd7b3854f26143fc599c302fdc7b6dcff