Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ba407b5b68f55…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 00:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a276333f062b825ad2d49effc04f19e8 SHA-1: beb9584455a582df2d1918f4626b0e9e7910fb44 SHA-256: d23ba407b5b68f558e9d543f77f388689c98a2e9342792b926947e6309045a01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites, likely for credential harvesting or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=fast+metabolism+meal+plan+pdf PDF link annotation
    • https://room12shio4.com/contents//files/kivugapekofuwesoz.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/dizimirobalowo.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/6clp3648t6vjvsr90o2abhnufj/86304525871.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc8c72cf5---bomajuvidatu.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/54630194888.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/viromodoleta.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/36921343146.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a37418229b2---62904342924.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/36826609654.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ctihmfl3lb46ge0egucc69p9vf/27583936795.pdfIn PDF document text
    • http://heizler.hu/files/file/vuvudafusagumudisige.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/poxafupanajitukaxiguxefib.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/80822828490.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/texojerojakegufomebasup.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/52081216575.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/titonibo.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/fexivunadoxud.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975ecba2c7d---xunakijikasoludosazevi.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/3056865440.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/zurewadisafurewopidani.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/63973911258.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/fakagozetu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62581e797---xomumakevepakazavodu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfb7d7571---xizazunot.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/15504182525.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/4nno7gupqtuin6gpqem2mhak83/27844759542.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_off0000b53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53B 14952 bytes
SHA-256: 2a901f7905cd115bf45f70dbd1e1113a77212c476b18cc15651b6f487ba4dc42
font_01_sfnt_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 10676 bytes
SHA-256: cd3b66c03d18acdb2abcd70cf84535f4f9136a16338d2c4c1df19a46c098315f
font_02_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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