Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc9a5ff1e98fd8d…

MALICIOUS

PDF

83.5 KB Created: 2021-08-27 00:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fb5b98fa974eba974e7f0cb1f312dbe SHA-1: 5c8f591bbe752c14c3656ecd2e3553e16901f835 SHA-256: fbc9a5ff1e98fd8d2c8d58ce70730025e0a069fa9c8bff6c52b15d9e254cd04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, characteristic of link farms used for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://sportyou.fr/ckfinder/userfiles/files/komemofaj.pdf In PDF document text
    • http://cokhibaosang.com/media/ftp/file/48287942298.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160980eaa7d6d1---22241655431.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8a8860d42d924cc2a89b2478d2f2b64f/29739452416.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f836c8a4---pagefujajivoke.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/sotitenimebuvov.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zenuzidobovek.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/zefudomerubawizetiv.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/37132232a718dac96df583fa5025ac2b/24900532657.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/ruvozitolagexuditosonuno.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/17696722065.pdfIn PDF document text
    • https://e-midas.ro/files/file/20998400583.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16090780ce322e---15433699551.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/vuxabolukibavikijorozav.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/95914112619.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ff7494db913d89370de8e43f8dc9ea4c/lidavivemajoj.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e60a2fb3b---30789587618.pdfIn PDF document text
    • https://shopabrang.com/images/files/39040560917.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/busmit0rirqt1nq7a234kc6kg6/4502725900.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/5524570143.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d208e48f15d---wuzixililo.pdfIn PDF document text
    • http://clingac.es/d/files/lajiwizaxevopetorovilof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+find+rare+pokemonPDF 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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 17188 bytes
SHA-256: ebb85299cb09f634443d7a7e0212894d25f1ad8fd09ae99ba9954a3b81bdfc6b
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 10616 bytes
SHA-256: ac11d0c0b73008139dd38a379a9884c3ba20b17fb4c4f64b95c660c25900b9a6
font_02_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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