Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3c525aed8ac76d…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 09:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98a4086f44bd825a4b71ee018ccf34ef SHA-1: 38ff0f6a775e9e86c878aa2717bdd1a82e683322 SHA-256: 6e3c525aed8ac76d65892de3e2f7ee684769735b8de9a08b77c9b25ff24f21ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=best+excercise+for+glutes PDF link annotation
    • http://alexanderjamesbackcatalogue.com/userfiles/file/jifiw.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dde5f5a1386---60178736058.pdfIn PDF document text
    • https://derfo.info/resimler/files/56058053314.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/pikox.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091f29fbc684---87057649650.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/denifonozusigovanezisebur.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/49100457639.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6569ced11c---60794972591.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/puzidosiwumesobe.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6630a434b---18722033332.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/70c1816e0e04499efb6f835e9aa26694/bidojomujobofilapuxikox.pdfIn PDF document text
    • https://cubic.is/userfiles/file/93260334318.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/didexemibizibenukoxuvudo.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/40e0ff26715051aa5773bcbaafcdb8f5/gebesasixovijamagujubovix.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/90c89b3e7a31d96acf93fb5904de554f/31510652446.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5dda5d4c9f4797f101a5ccfe93676dbb/danikavijemagibar.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/78346917786.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072715ab3b34---23288118915.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/57722924207.pdfIn PDF document text
    • http://vodova51-53.cz/files/43359751071.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883970413b---97281329793.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982efd42095---ximozobolaboxuge.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/jewoxefitubaxekosakamoka.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/56583968492.pdfIn PDF document text
    • 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_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 10500 bytes
SHA-256: df7982cddb40e9111e4ed45d380beec23ebad1e7e176d7daa97d8fada49418cd
font_01_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 17328 bytes
SHA-256: 022555792799e15385c5ed4a81bdc807a199dcc8b9c8dbb0803cc26b150a8069
font_02_sfnt_off00013f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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