Malicious PDF — malware analysis report

Static analysis result for SHA-256 9053ea59c3bdb3b3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-22 10:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0cbc19786350eda3d4b23987b295fb34 SHA-1: 14b4acfcabb703faa95add7dc960fae11f55d306 SHA-256: 9053ea59c3bdb3b31a8d65e04fead4516ee813380ce8d53b169b21654be56875
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://zulaikhatextile.com/userfiles/files/pafasi.pdf In PDF document text
    • https://zniczekowalczyk.com/user_images/file/kaginawosuxuvet.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/puxudoviwosofepamewepi.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/74789884824.pdfIn PDF document text
    • https://intersat.lv/files/file/37779647036.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vonuvoji.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/wudidipelikakizifisufi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614113cf3c7b1---7452811565.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210920205556.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/figazirolotu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/xewamonewotegoze.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/jusapagujovin.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/nerudeg.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/xifugatazomugijuxogeneguv.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/6033221174.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/91852884512.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/kesekizosa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9bcb8c01---famidaxixopusepozize.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/kopijatimedovujoxusu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/21503679221.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f0da295928afab5aae610bcb29ccfe9f/59672093582.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d107bd731---77516160823.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/29729246775.pdfIn PDF document text
    • http://letdentalab.com/img/files/maboxiwas.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/48615470217.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/wopuzu.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/zavijijoneza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=redmi+note+8+pro+root+android+10PDF 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_off0000b7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 15732 bytes
SHA-256: d648c42b74e43c924a60fa4baf70cbb0821e1f04120e16cd63e3be4d4c1a5be2
font_02_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10768 bytes
SHA-256: ef94b4255edb324a70fd276b4cfec554603856744a81514558e5a63f8a873860

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