Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9574e46943be81d…

MALICIOUS

PDF

148.6 KB Created: 2021-07-22 01:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01a445a67c40dada5870c86ef7fb7a46 SHA-1: dd0f9753d72b12497b04f4bc2b74b41e09408bd8 SHA-256: b9574e46943be81d7cbbb63a731178a9bf098f35f4a3e16b7948612e71516a98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://melz-feu.ru/upload/lonovud.pdf In PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/17785697891.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/06g72abalnjftmtaj5n8b46nuo/15882294950.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/30330321492.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/289a9ce1ce186afe447144e35d0b34e8/88519366822.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a82325274---54335434520.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/2536601825.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b979ac2a897---sutivagonotowi.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/n07ec7h4bes6j961v6pnqnr794/nufizujimumug.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca208e4430---48360491157.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a8cbf1bccb087e2ffc243bf47ad35be0/pogilufajete.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098dc7e907df---87484712786.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5d66b8f1---97614595633.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/15549729859.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/jedujavowikadimakokexaj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adbf1aac2---nuwijadet.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/14527528202.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/18245058034.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d33c0d004---48825909792.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607633d12685d---nalefupiwefoliparopajigig.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/zedajogajokedibipimize.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/rafewenuva.pdfIn PDF document text
    • http://muszempilla.com/files/file/lokakiwefigojesozerigutar.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gn8v9pgkq172me7ueb4tqhr4h4/tidajewinod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=applying+for+fourth+grantPDF 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_off0001e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E634 17540 bytes
SHA-256: 75cdd5a3f9818b6c8dd6426368a8814202eb7d60a7f2c51979a4c93a4ef74a96
font_01_sfnt_off00021410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C27 10532 bytes
SHA-256: eda491818540f87968c4608f73d56b16ee967fc12fe7496f6991de2ac02b5eee

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