Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fc24531abfd208…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 02:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76635f5bae1da250253a7e1c7a14371c SHA-1: 02617d9cc9655fed539e5c26b7e88b7742751e1c SHA-256: a0fc24531abfd2083144129fe1ed2b506bd1e9b8440ee579f4b09e7669281781
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://jedwines.com/cmsCart//upload/file/palutasapixa.pdf In PDF document text
    • https://lawina-radom.pl/files/file/teworaloleruxiremuvi.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/gewetipivi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b0ae242a---96264526915.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfee51d83a---26902736595.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1524a4ccbbacf50c5fbabb27c0b9a717/sotikida.pdfIn PDF document text
    • http://computerdoki.hu/user/file/sikagoguledusosafijoniw.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/mowumurubameseworapafutex.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4532klcohoq97v8av2pjc41230/20854668735.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/pbouicdsq6e47g3mtle0b4l0n6/70863902227.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/83342261549.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/a4ad6k24l5vv13erva5m33n4v6/18330262287.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/90257046800.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/18938770926.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rodixajotuwufenigojerufa.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d393d629d11---xukepaxudinuf.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/jemupagotibevuminisoxu.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/bitajoripesitawokuna.pdfIn PDF document text
    • http://zuche0551.com/upload/file/woloriv.pdfIn PDF document text
    • https://medtek.vn/storage/file/bidik.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/rexepaxutaku.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b7d1383b---73039307520.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a6b36c909b635f5e76c6760e60c15105/16204304308.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/zimazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=see+you+tomorrow+thenPDF 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_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 10280 bytes
SHA-256: ddaed2ddb968859cc376b34bbad9825bc86014457f9494cdabdbdff996f30a79
font_02_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 19348 bytes
SHA-256: 29c5979c246bf3d7259bb73ecf0a4aa573e70ed817222b1390f976c03a02564f

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