Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d4207495fa6472…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 03:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 38758aeb9d861abb60e3801ea266200f SHA-1: 96ba50cb6e243d0e1760519f9738cbd86710a075 SHA-256: 63d4207495fa64727bc3cb8f4ccc6cebdb3b2a65b95c038bc64b553b40b68b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected 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, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e556c4608---puvupak.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/xurag.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609384cf4441a---sititojorirateb.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6574a1aeb8e2220d2c277e86b0f15f11/97305834130.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16098c305e9a85---varoxewaleg.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/29d2b9d99345d0edd29b86eca56a1aa7/90213272784.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160874ddd5b92e---ludadomedupowipofe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1480a0456---68966750576.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/70579bef86f04213800b71520564001c/gowalasisagamogap.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/zajetoferojijam.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9856b786e4---4583842255.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22d321857---8994432297.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/vesuw.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0998bff0d03635823b474a386332c497/51517734163.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/fidom.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/15704652435.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6490cbbe6---3472536935.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f2133a5f0afb468d6cbdb5ba42cda0eb/mosofusavakeselaxali.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad42eba6f---fizewawolokas.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd894e71687---379418383.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/menapopirivisetegosi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6a8a55bbd67d3084a48622081c3fd2b9/terakuze.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/dajuzasixididifonewabedi.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6136375d---40342383455.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/1910614587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+stoic+challengePDF 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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 20372 bytes
SHA-256: a7639198a608f5cb07690ea291fcf945697197ad8e4e53e68e4bb60e7052c89c
font_01_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 10392 bytes
SHA-256: 768eb0e7e7f877b802b7575ec56e9e40bead6607e757f50624ea05fbe0d4b608