Malicious PDF — malware analysis report

Static analysis result for SHA-256 401bbdd30185000f…

MALICIOUS

PDF

68.7 KB Created: 2021-09-05 10:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33637d220199b18c302cd87a61c062ca SHA-1: 7998ec50c3e0239bfc581ef20adfce577d82bc23 SHA-256: 401bbdd30185000f79d914ad9deb457312d67e072b41c5201d957c2174cf1559
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b5243e1c---migiwomuxijipibepebafewo.pdf In PDF document text
    • http://dienvietbac.com/uploads/files/kalenegerox.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210625092648.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238de594e4---91632171135.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/91224572224.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/riluretenufitewe.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/sivorirujunexanati.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160728fcb1c175---60005792984.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132d438ee2d---33779522104.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/7343698327.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/zarifub.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/wefuvugukanejutuna.pdfIn PDF document text
    • http://thaide.org/userfiles/file/tamupegegeri.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/air9o5299ppgk4b7ptam96j8j5/28374443956.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/756e190be0d9094a21871b4e996c3c54/wakowasumefuzux.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610b47c0619b5---29704817880.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/kubiwap.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5920ffae---6709695281.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/vosukatosarifafonaxitira.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/6426710310.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/tubexuvokofegenarisadul.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/3260318662.pdfIn PDF document text
    • http://vce34.ru/attachments/file/95529126018.pdfIn PDF document text
    • https://506hlapeta.com/files/file/vepuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ellinika+tora+1%2B1+pdfPDF 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_off0000b017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 15492 bytes
SHA-256: a934f7e7629928a24a3b7d857226d221edb0714ecedc4e94f62c6c1724ee93ab
font_01_sfnt_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 10316 bytes
SHA-256: c755d1afc41a251e9307ca762afbbde487af3d8172234a92918e746c8df744a1

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