Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2b1e1824fa728c…

MALICIOUS

PDF

74.9 KB Created: 2021-08-04 23:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e3633e2890024d893aa0d3d3a624abee SHA-1: 83287cd72d552ae89ab75d5458db533ba1c6b006 SHA-256: be2b1e1824fa728c71f63f70ae207c68d998b12c3af37acab49acaa04b066f8a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://crysiq.ru/uplcv?utm_term=google+sheets+vs+excel+reddit PDF link annotation
    • http://myexamadvisor.com/fck_uploads/files/duwetelaxewusorotozuw.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/dokajuvudukevilodoros.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078deb4b194c---40223593776.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/xunekubefi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc34628e0---76438020991.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/8634131500.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/nidezubaxibiwunipogu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/boteleloruxizexosovifas.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a8e2bb78---gosabadagurutizisamafa.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/35v9nqlr7q66tj1d0spk926io2/zapekilov.pdfIn PDF document text
    • http://web68s.com/upload/files/zunugarorojofimej.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2bab5922b231840b2c2475ab136a8d3a/goguzawazaxijumiromiwaw.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/37019076305.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16103b20ab351e---50533324334.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4apnae80ge4dplgpmoqabf9lg0/62441466420.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/20422524505.pdfIn PDF document text
    • https://ckmandarin.com/uploads/5411755959.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f604e03e80---jebajawexaweg.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/pexugabilisiw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd19c3703b---62531231788.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ngj1r10v8pg1qumlfbhm7brsv0/tozedinitegogosew.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/be42418c07cfa6a0d1a98596af4001f9/92693211672.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_off0000c457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 10592 bytes
SHA-256: 796c73c98bde14f250ae851d9e2c80f3cb260a91eb581679de21e768e8233228
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 15712 bytes
SHA-256: 3f74ed554745dde51a906170760f07999082dad4504604ce3b45d47f3d9343f1
font_02_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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