Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9531c0c0432c0b8…

MALICIOUS

PDF

78.4 KB Created: 2021-07-20 13:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 862d84dafa482d82d450e15639ef9a23 SHA-1: f60ad934b999d41812bc222c847008f5d02d8b4e SHA-256: e9531c0c0432c0b86bc35dc5023826e7964a95d65d3e4662fdd8c7b3ade29a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document's structure and embedded URLs are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://littlefreddieking.com/clients/65037/File/zubixanisanomugenexezom.pdf In PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/67444013424.pdfIn PDF document text
    • https://purefeeling8.com/data/file/ririvowir.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/77091501677.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5585b2af0af178bdc8bb4576bf441147/82292094676.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be27a3f11---vomiwuxutatowejerusonodix.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/venatelemutefikubuwumi.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/femedexikojugezibusuxuxal.pdfIn PDF document text
    • http://hncastlecable.com/d/files/24015062849.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0olsfvuci1m5le8td21ovmfivj/34270663459.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v6gk842ubgnuth1egonmshe5cl/dolezarufagejubelokowuz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d709a715b---47013501291.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/runomefikuretolamajuzir.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/hafjemvl5v50tpctdknl4ejcb4/fagikakaf.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085655214b1f---14595914271.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bec154894---6546714165.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mvrmah3hvc17do11ternf9demp/55604782587.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/jibuto.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160839ecfbea66---38624842144.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/46ad1a5f6a5434aee4d3549cfc7f606f/zereb.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/zetudagijivarobegozi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b36263761e0---65353395301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+the+total+area+of+a+triangular+prismPDF 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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 17504 bytes
SHA-256: 301c5520e3b95d12e3e47a4c8f2cf337c3031599bc840d0ef302040d42bcfe4f
font_02_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 11124 bytes
SHA-256: a455288f2577f0e8b2e69a9731a526f3c06582f4a33ada96e1c61e46fa528c17

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