Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed3854b82401f60…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 02:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5430e0bb64e2689855d0452b7c2da4b SHA-1: c8e278a9f79b5822583a6cade2081a250606aea7 SHA-256: 6ed3854b82401f60a59867fecdcc93adf4a914fab93e3c1090ac6802a7f5aed2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for JavaScript exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=receitas+paleo+bimby+pdf PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d218337324---14344565411.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/renunelotutajexuvox.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/43677820965.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/907b9175fe0171791205c0baebd32acf/95526763571.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vikadurifixugubez.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/lijunaliwakobir.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o2je6qvlevgjc70vm66n3vic3s/17430675712.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/davarumajuduzonikutate.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/wijuba.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/meburijowujutezekawedoz.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/jubalobumotategubi.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210822061329.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/646d79gpkmi1g4uk85r8qmfn5s/rajig.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/92418270135.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fc7e80c63a66872204e25f9cd43167a2/3938613703.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/fixawarotizijugafetodi.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/40172881517.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/84653978849.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/vifemilimipolosu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c72bcd6eb---sazena.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zudejojifigofivoja.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f020a7f09b---44626429259.pdfIn PDF document text
    • https://chp-travel.ir/data/file/96894379603.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_off0000be7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7F 17276 bytes
SHA-256: 7f860d88ca1bd893a2bc5e444adc819f403f9773b9e8803c46ae990e7fdd9105
font_01_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 10876 bytes
SHA-256: 9baf3ce0261bc07df6013471c98a17db4828ce6fba3f3493070e19d9ce5c8dd0
font_02_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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