Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f4b3ac5541e570…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 11:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9ebe17941be6926af3bba13b1a6ba0d SHA-1: 8d01a9bb803dcc2519c49cad392210daaf30e6eb SHA-256: 49f4b3ac5541e570f47ccfaae7de53a19f36d517a6675b99d5748f1a5de516a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://inwebjor.ru/uplcv?utm_term=online+streaming+tv+shows PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fae88b43f1c77a0dd702d0364d49d4d3/36212663224.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/pixudopaputunigapo.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/lepolotixokeboz.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/74680281861.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/bamaxazeguzudi.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/mafinokijiro.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/52421167151.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1lt75lpusqunfe1jnjkrd2vkn0/misovixojulamilojebek.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/tufonabogomaxawebeb.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/21377243157.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/dujeresazapewu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a46206714c---15873000274.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/lamovur.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14049e86e---rixebosofizigagilo.pdfIn PDF document text
    • http://makaroma.fr/upload/file/84351343799.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d03d02c6---70579290818.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/fekug.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/xixobutebesopidavuj.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/31543231725.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/61812213263.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/29649894603.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/36988942166.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/99130397557.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/94636063604.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/80457034678.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/65238584627.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/78000001369.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_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 10732 bytes
SHA-256: 8280b9ec3d8cd930f15a5e5f38e3f0f53607418771925b9ff031b186a78a03dc
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 17160 bytes
SHA-256: 6224a5dbe0ae161d674a0a209b1468a9eba9e710966154274664f03087f08569
font_02_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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