Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb86b2905419e885…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 06:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 58e23f789dc75f1597575f14910293f8 SHA-1: 45a677823ea5219747406cb8c8bff2d268774dc5 SHA-256: fb86b2905419e88570ff4534aabc798bf20a20fd0857b1d00815629f34255348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://chcial.ru/uplcv?utm_term=mathematics+lab+activities+with+record+book+for+class+12+pdf PDF link annotation
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089e1f323b3e---lulepanagabaruxerinopu.pdfIn PDF document text
    • https://appfacile.it/file/55581602721.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5ac99be5c0c6213b593bdee1e9060508/17119052648.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/56e856911777e18456d71af6247cc86d/53731238816.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/59296032640.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b78d22212---bodibebavaramibisiwoxumu.pdfIn PDF document text
    • https://diphong.com/uploads/xinuvaradebe.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/ligukiporafar.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/18307995109.pdfIn PDF document text
    • http://mousike.it/img_ins/files/wokososowamesun.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/togeguvugukezitesagesik.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bap2sbo4sha0t0vm6gsm6eplr1/52745624322.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f9149768013776a595b12c7d24e2b6d3/24181725939.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/rutoboguzadinosewe.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7142763bec65fbc02f24bb745722addc/rolalusetekupo.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2r6ihvt2b7m5r6hjemgg3ajjlt/70990130030.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0eb0223b---dezomapulupupu.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/13149848361.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4cf36f9cf---18919612329.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aa8e2929f---38152779350.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/48167099771.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/11524681880.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/zabokaxinogepamuf.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca19921257e---tubozeva.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e22a5f9f7fc7aa810f0f6aad87dd59f1/sanoduwevinesobafuzeb.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xaxififanalevuzerulaj.pdfIn PDF document text
    • 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_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 11328 bytes
SHA-256: 5bd12f3f13851595f61c89130b2f5a40e6d7b3835bbdf3426f85150539a26429
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 17208 bytes
SHA-256: c12426a2db5c5c895e32d0e3355f63890bfce041575ad42cbd1c639b35a53fb0
font_02_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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