Malicious PDF — malware analysis report

Static analysis result for SHA-256 9591584405b0264c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 01:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9cfa508039055bea89da974db945a4d SHA-1: 864b2e00817714e75e1a49a0f8d8392a6080a8bc SHA-256: 9591584405b0264cc5c838ad996b8fc3efbc5a4ec6cf1f0bfa88510f80ef9509
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs, several of which point to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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://snnet.kr/board_pds/fckeditor/2021/09/file/9453506903.pdf In PDF document text
    • http://studiocinti.eu/userfiles/files/loxufodefanoboke.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/wurezorawidijukazazeramu.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/bubagoril.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/lonosoz.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/sikuxezuxelep.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e83adad9a---65480092373.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f51d00242470b0ebac2347ab6e66c3e8/geguxodivunu.pdfIn PDF document text
    • http://balalajka.nu/media/sumesetimopimox.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613316a5a45e0---jezatewuxi.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/20086499578.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/56168887680.pdfIn PDF document text
    • http://congtyvima.com/images/Download/24565640688.pdfIn PDF document text
    • http://calienglish.com/ckfinder/images_store/files/67950879022.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/36199929502.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/pigunex.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/43819324649.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613db8a0e181a---gurumid.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450c670d18d---zovufebajoxogarig.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/jifiwewotawamulobusadigoj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/02439f9f936cfd01ed5dc936621e10e0/38225459858.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nenajajefev.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/9801702756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=why+am+i+not+getting+messages+on+my+android+phonePDF 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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17720 bytes
SHA-256: b82640cb96077bede320644c7558b8354c00468f7ddbab864f970aa44aebf1ba
font_01_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 10900 bytes
SHA-256: 6310aacb871f105b69e49c45a137ebb4673824ab5c29cbbd10b95151fc2b26ea
font_02_sfnt_off000134a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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