Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e79256b19b2becd…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 01:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8201c488aab8cd07ec93669672e8120 SHA-1: 3f746004c2ce0b66f34f1580c9a53f808cf40f6a SHA-256: 8e79256b19b2becdd5ccebd1a8f7c7cecfbabae95a443515030ccf2b7f3ca471
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The embedded URLs and the heuristic findings strongly indicate an attempt to redirect users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bc384416e5b09193b257729d024a55d1/59276351751.pdf In PDF document text
    • http://xinyuemu.net/assets/202109/files/20210902165100648523.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/71450148079.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/66344783124.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/95976403170.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/15356167857.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0ae9da47---misetefamerewedis.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/tiwikebusex.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/1413962454.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/mogifosulefag.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a2e8af59ce3eda1c1206482fba2a206a/bobam.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/87229127721.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131433655e5d---18398672198.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/visemasexu.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/jidikegezotajubexiz.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cb985b5005dbe807d66ed00f587db9e0/xuxasabufuzofexuwiv.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/lizubelikuduwokawini.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/90908940156.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/60127012945.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/nanabovajumu.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/95215457818.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/aa751676924a93ea88dbb477d28c5852/piviji.pdfIn PDF document text
    • http://ijfbn.com/editor_up/bufaridatavifivik.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/63655048332.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/96927791816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+a+video+more+clear+on+androidPDF 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_off0000c012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10596 bytes
SHA-256: d83d56ba288331fbb47c5970c5a37da3ecee7b234e875b8548935cbbd2a1267b
font_02_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 16172 bytes
SHA-256: c304839ec9e5c23f821aa492c8b8d3efd5a60f3bc475e910e6c705d6e2f15005

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