Malicious PDF — malware analysis report

Static analysis result for SHA-256 6712a1d3516f85df…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 06:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70c7bab63f1be1d42569fa80c6408f48 SHA-1: b2cb018cd6700bfb8ad30b3bd9a78f5231176df6 SHA-256: 6712a1d3516f85df28b30e40d3901fe9862c9b51f6f433b619db90b233e3a138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing by directing users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://asremajazi.com/uploads/files/jokexibilinapowivepelu.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4d5e382e2c9acf7bf197ee1c0a0a3c41/65630420815.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/81792797769.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/xesebinogojavamo.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/58391986826.pdfIn PDF document text
    • http://twtime.com/uploads//files/202108040112317527.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/60181573666.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea319deec---rufinotiwowibalasaseno.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080223393395.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9435cb8ab---693488081.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f54c904cdd8906de6287180a20f2f199/41273259102.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/eae93a56213da8ff1e4d46651becd3d5/kobava.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/paboximuvevifem.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/35884851721.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4416e131c---3789393853.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611803e34f911---10118140286.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/mojexa.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/53678732578.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/17606858924.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3b0f2178ada07ccb5c2a8eed60a0fc50/80387558134.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/20313428822.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c9100462---tagawenukogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=plexo+coroideo+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_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 20344 bytes
SHA-256: 370e7a52aaf13d1086bd0212747d1120d2d58ce49d1736007698e15b030e6cc0
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10184 bytes
SHA-256: b33167abcd8980082c7dc660125287230ca0edaa7f79f7495ec90ebb7115dadb
font_02_sfnt_off0001202e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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