Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d2a10b20ced1ce…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 10:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21fd094983c5af5f61c2d0a80a0fcff1 SHA-1: e1a30c44ba9100c8a37d3aea414d522fb32ca83f SHA-256: b7d2a10b20ced1ce6685f3733f0528f070c7f2a5c324cf6d03b45cb0d32c9a1b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3bd4a7e2e---27167477152.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/pafen.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/budisiv.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/92398892702.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/7555040936.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160edba388a813---98217000432.pdfIn PDF document text
    • https://magatek.com/documents/file/50309730008.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/85355566546.pdfIn PDF document text
    • http://farashimirooz.com/files/38245959769.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e57310b127851ef15fb86491890a28c6/20837766971.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/ronulafinukorudan.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a61b5de46---62450579760.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/89175414612.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/1597845498.pdfIn PDF document text
    • https://codecs.ro/images/file/zedusanebabubo.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/lipapirerimirukimagaw.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/92074037305.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/gujokuxobejobofurivazaje.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/f3f6o28oess9h7sikoss1li9l5/96495777519.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/furox.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/fuzalaxanupagasumazudavi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607301ec5d6c7---xopuxazitonubenirifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=que+es+tecnologia+medica+pdfPDF 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_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 18452 bytes
SHA-256: 2216c12d363f7953a8e329be3595ce544bf0dd1ee7c92e05b101f51e46f99501
font_02_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 11024 bytes
SHA-256: 80d4a17e5c316ad51f998169216a7ffe40142322b1bb97fc2e727ce5d3758e30