Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ee6ac4155650c8…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 10:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9eea9263f1a0a52ce61916bae3893fdf SHA-1: 6efe0b7b680fe3f380934cb7db48e047dcba7b7c SHA-256: 13ee6ac4155650c8b895b139b58916d57059758d5baf1276c196c2f3c298bfa5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links point towards an attempt to manipulate search engine rankings or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed8b94cad---nudejejalozikezaror.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/212db5833679950487eb8f560b6b740f/furazudiluvafevedukiseri.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/80320369964.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa21ea2c8---fijowifeke.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/bojosiziratuvokavaves.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/dc030725bb0acd29364638dabdbb5525/filatojemuwekazugawafij.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/39729941464.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1584206dba---maxikogijixevorugujokibu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822bd78f506---96616528392.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee74cf400bc---xiruwenokiz.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/jizurajil.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fob9d6ja8aocmcnbvttiveipsa/19434422034.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/33218010162.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/643e4d50c7fbf98f17fc258d616dfc52/23359191230.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/iu4ukrj2pt3rvu80sia1bmu1je/45934353093.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/266nc7dbi4q3ju2tpudjrq8ld0/39522072213.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7133e0264bbf83281b4794ccc57b7d9b/kebefijaginom.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/nosoxedegodutawojukidodev.pdfIn PDF document text
    • http://axwelindia.com/uploads/28470470855.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/51749212682.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd803e4085a---53214880497.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475581f6fa---tapaboboxojebodujuk.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/bace8e5db1416496b5f48abfad8be06c/viwejoziximudiretomaref.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83108eca4---pegato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+are+the+core+electrons+of+strontium+cheggPDF 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_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10876 bytes
SHA-256: f9e971521a7cc52e6f818e9380d5cf15174bbccc31a2701679a17ddc32bd9884
font_01_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 18312 bytes
SHA-256: 9c0aaba1b06fc78ac4f6b12a53052261414f68ed003ec9e74271e673172673f6
font_02_sfnt_off0001402e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1