Malicious PDF — malware analysis report

Static analysis result for SHA-256 de072cd0b6be88f3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 07:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fcddf55026b62d71495f24ccfa6cbe3 SHA-1: da46ca911c32cf56bd79bfbb110d2a4efe8ff55f SHA-256: de072cd0b6be88f312eadc27f51d01dbbb98e07cab929c148ac0b82feaf63e78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vibratingsieve.com/d/files/widenuwinoris.pdf In PDF document text
    • https://partnyor.az/userfiles/file/levabugeturebaditojulix.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613869cd91a75---datutazapukudipukotibiwa.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/belolaxu.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/jaxamu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d83fb55e2---xetoparewuxodibamiguto.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029ae96813---29681433296.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/r5bpae1s0p1qaj7m5kqo3lr470/fexuvomituwizasi.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/nudiwalafakutituxose.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/lizabewopimatedem.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/xesasevepe.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/jogexagipizopaluz.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/xuribobaxapi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613052510a09f---96843302236.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/kosekegikuvusajudenan.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/32857783700.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/36538170013.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/31701102522.pdfIn PDF document text
    • http://blccy.com/userfiles/files/37116086277.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/43558612104.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f04fbd518df74f8c32255ec465e24c2a/dokojezasemedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+android+device+managerPDF 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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 16812 bytes
SHA-256: f7d43cceb5ba52a50cf456ba2f498c89d9241610848da5e11428a22b3f5c024b
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 10828 bytes
SHA-256: 57838c3500d1fdce4f3df99e1e21c3d0e8cd6cb08383d8ea7a8a77065e9bd8cb

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