Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b84ce5879bc4821…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 12:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9ab15829a06a744dfdff04845721458c SHA-1: 54340a7067df913893269ff66e1c4641ec37d44f SHA-256: 7b84ce5879bc4821354ffcc37a966c9b06057ec2a9223cec1029e9a166613390
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host and distribute malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a86303090b---80338803902.pdf In PDF document text
    • http://hanasushipickup.com/uploads/files/46534751590.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c736447bda4---reserigevuwibibumiwamata.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4aa4ca6b---zokonupoxuxosem.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c36d550c24f7350cf1c4c7a9d2a9886c/25769388417.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/e1rb1eqj9p03b9tf3a8n5kl1r5/piziwa.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/21115151586.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/wobogirato.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd832fef39e---62090570443.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/50478442026.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608415a1145c7---18378580672.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/58178752745.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/putegiga.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dcee0a547---tosokulakelulaviwito.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/dipelemavuke.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4ad88e45---66399676650.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/42066647381.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/90861346038.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/sitowunivazati.pdfIn PDF document text
    • https://actorconseil.com/files/file/27768260782.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c777b7b45ebe9a09284184620b874a14/47959073232.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a59bf90c46b---negezibu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/81b92f32b29d2b5ff5ebc0a58fb61724/fetinovug.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/tirovu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/79023928aaaecf8a873a8d575ce97fe5/54599783437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+catchers+of+all+timePDF 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_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 17220 bytes
SHA-256: bd7dc10ffcf72121aba93e115b70fbbbc44c973e00c3b5c811c6b2b6369ebbdb
font_01_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 10548 bytes
SHA-256: 6ca75397139d137e0bcd6001a74350badd6449101ab29261dbc7663ff4e24796
font_02_sfnt_off000143b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1