Malicious PDF — malware analysis report

Static analysis result for SHA-256 894fda3193b7ef18…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 23:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c1f3da175401a75ffe8f94dcf5d3dc6 SHA-1: 12d2a1057240c7d6b4ca2943e6c58962b654f02b SHA-256: 894fda3193b7ef18ecff0164bb4dcdf74e6076ed64ca68478863fbd16c187a07
172 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to host or distribute malicious content. The visual download button lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.corazondelsol.es/ckfinder/userfiles/files/mizile.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d000ccea245---dadokukamerobudoxivezarig.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/rufet.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/22d79d7109120d2230f7aabe23c9e8e5/togadi.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/88712881448.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jl781l3ij39jkrdehh5kvp347t/kevizozuw.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/pizodirebunuduj.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cc82c184e96413b0de8d6b88c42998ac/kimatejurawixi.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/sijanabom.pdfIn PDF document text
    • http://shesob.com/file/files/fureliguxebaw.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a14d6ab469e688d6b64785a21851e6ff/15406260545.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/gefasadumofedinezopitaga.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/14181090859.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607767fb259db---pazefize.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/vesovijujazonutus.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/58684797316.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/67445573374.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/kowogudijubazidoxa.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/xodobifivud.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/zubanoxone.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/90175134798.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7828f1c8f---39483233202.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/kepafu.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/tojupuwa.pdfIn PDF document text
    • http://promador.pl/userfiles/file/50790291661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=polytone+mini+brute+ii+service+manualPDF 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_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 19056 bytes
SHA-256: 0259a7555ec892b5d0736d423b2b121c065955cdfa8d2eabbe39dc5129a210a2
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 10812 bytes
SHA-256: d388d84ee9112274e605e449f9f4e7cae7711090496ab1e09ba3653db9227a55
font_02_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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