Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f52c565236548ca…

MALICIOUS

PDF

72.0 KB Created: 2021-10-05 19:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d637f9e513cb8643b70a4f4945377683 SHA-1: 021980d7d815c40ea406b8b50edfb7d38e8dd675 SHA-256: 5f52c565236548ca2cb6068c5dc5f38a40aa39f0546d0b8161772a8f8e00f737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://foodphotoshop.com/userfiles/files/topavujikegeti.pdf In PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/64000234521.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/vebubemawoxetizimelejaba.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/96780085014.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/87389463733.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614df072dc7a3---junudapumakizag.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/71605841632.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/82108846557.pdfIn PDF document text
    • https://tele-video.ru/upload/files/mesodalutizarug.pdfIn PDF document text
    • https://ubranni.com/uploader/files/tabatukopemisifewu.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/nuwalabow.pdfIn PDF document text
    • https://bachson.net/upload/file/63932279580.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/10414247813.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/wepogoxopalogelega.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/turewebiduwejasaran.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/51982414660.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/kuvonumu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/73862087859.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a637d77268b8c8ea3d2e1166261d3a83/24583443186.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/83865655693.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09f32c7b3---42344194683.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeeea28e39---26084380583.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/77177091711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nothing+gonna+my+love+for+you+mp3PDF 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_off0000b543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB543 17016 bytes
SHA-256: 6a63ad1c32c7b75bb0880dde70f0a980c874148c775c7be6480102641eaff806
font_01_sfnt_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 11068 bytes
SHA-256: 40094b6527a89cfe9c0db507215a76995c39660eead6720c97bcfb5a01583a40
font_02_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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