Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1cbd5fc52faf1c…

MALICIOUS

PDF

78.5 KB Created: 2021-08-01 09:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3121e93b729ea48277599c7b4a6cfe21 SHA-1: c9b5c0b457c14d1b109f9f3ad6cd1d9f553cb45d SHA-256: 5b1cbd5fc52faf1cb879a45a4ffb85b8527629855fbb30eb9e26ffb9fd7093aa
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links on disposable or compromised hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ba75106b---nanunofamodu.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd8ba525f4---69795188668.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c54ec60cf---mamok.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/7044809102.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/fegobebatepip.pdfIn PDF document text
    • https://fishuntpesca.it/file/46714456752.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/81408684903.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/33f1b3cd12e5a5353e62a970c1717503/digemazowilakifawonaza.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8865e0f354cc81eea7a8e7043b4d6b6b/jaxureginirabopebaseb.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7quoeq7p8mt5mlvej0rlbdkee4/koxogebitajesube.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/vazaso.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/11109713863.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/felusuj.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160833d406b0de---rodamubefixufuludos.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609156978441b---85984769852.pdfIn PDF document text
    • https://tckontrola.hr/files/munugokepog.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/83007951878.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba890aaed---87253517944.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/pabopofufexatanifudib.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3pck700vtb3kaboh82u6tfivvq/juvimevowuletomigelaxa.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/81299759616.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/14893539659.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sdanfcpbgm9km15lkj4eqioa1a/14087696977.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3859de5fba7ee28e7aec7bccab410336/vugulemigopu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609007502cc05---pubusiwopinedufodudapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=trapped+in+the+mirror+pdf+downloadPDF 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_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 10644 bytes
SHA-256: 9dbfaf26ea5227fc4cb352d94b9efd1d19e425077e90d2a667f743e3f1b0163f
font_02_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 16376 bytes
SHA-256: 60b9994571dc73d0a4400f5049a652e526bab6a4524a53297dcfd67d3af5ba4a