Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cbf4814efe5d87…

MALICIOUS

PDF

110.5 KB Created: 2021-08-23 10:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5a304a08c113be09c21468a1c5e9abd SHA-1: 5680c121c057bdc3430830aca0b2ef3f5e99a3cf SHA-256: 17cbf4814efe5d87bbb132bcd39ca062f5aa431643f28ddba15f035a414249ef
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm structure strongly suggests an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://rwdwebwebdesign.com/img-aim/files/gokokorudibalurigopa.pdf In PDF document text
    • http://omgmediatank.com/userfiles/files/30643201222.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa65e433d---weraduzefarezibepidawu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/xokenejibevaxakoda.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102ca13ce1---xudopimexesulabasirigerit.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/0989034de32cd42fc98da15c9b452c87/98861845125.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87849eea2f---girabageb.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5d0093c30d4b2f0ff47a35a32699f992/wegelugodosijudijo.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/61319323161.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2r0t5f06afg304siuheg4gms4d/sexozotogodixufiwavew.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/37787174456.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/gufaveridox.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/68274626497.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe5eb4b2f---kejesis.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/81120644739.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/44f53c743cbacae4a2a76f1f65cee248/lupopez.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/52383014217.pdfIn PDF document text
    • https://hssanesteban.cl/files/59574452104.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071957fdeb96---sukafibemopef.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f0b08a376d59441cba042f0028b74b74/rakebitubup.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/remupalajabik.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/mavexezimimagegiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wow+bfa+frost+magePDF 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_off00015034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15034 16232 bytes
SHA-256: 354c7266159df7bf2cbed666861e41b67a3d9bd93169b7881e74d9ffbbd3b0da
font_01_sfnt_off00017a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A60 10536 bytes
SHA-256: a01ca3a2a2279af12d5d4b894e31f9fc97589aaa405f674dc4392c1aea3d8b77
font_02_sfnt_off0001928c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1928C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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