Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e9cb510478bc62…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 19:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de90aa480b6a75006c9b17dc79d972c5 SHA-1: 3c7e75969304a9417076d23ae58f77621fb8c119 SHA-256: 11e9cb510478bc62cb486001723036af05036a342dce85312d28182eb898ec1b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is identified as a link farm, designed to direct users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca7bcf8eb---tigevowivapobabaxix.pdf In PDF document text
    • https://hlj-vibration.com/uploads/image/20210807/files/20210807043405.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/8916606435.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be65cc33c3---18456197446.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/widari.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216685625609.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/50284515aec59f3d323e589484f394d7/kunazigolivurolekoteja.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689220a84b---ludekelivi.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/fisutuvapixemujiwej.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b002a16d0c1---zufutut.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/fokosifamuva.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/62353571802.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ljdud166skak0u3kmcvobro8i0/92921483598.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b54376ad---27228545984.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dojulu.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/ruzukaluro.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/guwuxulubanipe.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/zivewurovubugerades.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/pibiba.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beb014e4bd5---fujuxeget.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e66265fa7---56314022648.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/96264458775.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/33445024204.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/folegapat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mentor+saline+implants+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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 16732 bytes
SHA-256: ac046007fb3aa7321905c55200f4f257571549882ee0b85a8d815e5b0062f683
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 10652 bytes
SHA-256: d96217031f6b79f45abf99cdfd44f1306c6d6623c41e19914e856caf09808939

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