Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48feed0a5b7643f…

MALICIOUS

PDF

89.3 KB Created: 2021-09-13 12:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6be0f7a7682e5557c653bab56ef58bdd SHA-1: f45f23e891034901b9a4e9d127e9b01f53e76c53 SHA-256: a48feed0a5b7643f6c9c89d3e541505fa2d6baff5a70fe6da330c17eadc02503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f07811401736b7139ad585164c17afdf/83677997540.pdf In PDF document text
    • https://charming-dc.com/uploads/files/202109111319299885.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-11/20210911075241513631.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/20509153744.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/93848877608.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/978096408.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/dojezejotanoruva.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/23708078073.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/45826763978.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/kavotojazepuje.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/16659728750.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/xixifefebinose.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/posozabenujo.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210907194914.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/venibejotoganikabivew.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2fab127e---vubuxarowes.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/wulamemexikananewubolun.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nokivimodovefinelon.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/witezulowaze.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109062008456215.pdfIn PDF document text
    • http://epmachine.ru/d/files/5498698391.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/39059b8a887b1126d507c33ef1b15b86/72291887594.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/mosusasos.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/kaxupezate.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/71151465697.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/zepilisarivemivas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gta+san+andreas+mobile+modsPDF 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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 17952 bytes
SHA-256: ee603fdc98c833f336f316ffe61c03db8aa60ddca78e9040b5d3bc259f04034a
font_01_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 10588 bytes
SHA-256: 6213014e6b9186669dbdf04e2436affd2d0845be97a7f0add17afb5ce8ce964f
font_02_sfnt_off00013fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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