Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa6f678bc4bbdd2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-15 18:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79132190da1eb8164e17bf7c59321d9e SHA-1: 997122cee700385671468c0e7f22ee60e71739e3 SHA-256: 8fa6f678bc4bbdd2e266157e2a0e36cdb9cc16b192e65770f255094bfeae12de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cairparavel.ro/app/webroot/files/userfiles/files/sonafujeg.pdf In PDF document text
    • http://parkingparts.com/Upfiles/file/31839543908.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/pagivabu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/18723912e3c099f31031fea41a0fb752/pafafadegitasifugaju.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/fupelagejapon.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/96444239076.pdfIn PDF document text
    • http://www.moyekolodin.com/files/motezenevuvem.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/darizoxusadesel.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd45081fa---27874999689.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/33124830828.pdfIn PDF document text
    • https://virker-ikke.dk/files/93879470086.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/87051503731.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/98873394208.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/suronewifajotusos.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jadafemu.pdfIn PDF document text
    • http://sooclose.eu/upload/File/latefajajaguneboko.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/5674988689.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/90412357624.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad60e0eb2---mifukumefi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017db82db4---gudixivagupinimoxibi.pdfIn PDF document text
    • http://brukbet.com/user_images/file/62149624327.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/46583131237.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631522197.pdfIn PDF document text
    • https://tmtteks.com/files/wugulajusivetuki.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/ligota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=house+rules+jodi+picoult+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_off0000c449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 17332 bytes
SHA-256: a3b7a8542835c523d53e7c1cf4929a5dbba4b32054a5481ef382af8f81da6309
font_02_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 10568 bytes
SHA-256: 1f236d8bd34c7be4e1bb2d54325cbfcae941fce4e6f0532f369c2b500acf9a13

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