Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcb0848388a39d5…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 22:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a70e94b6de6b47f0d78f69f8d9268f7c SHA-1: 9f6627b1f2bbd8e313435a178fc35a8d3e74a971 SHA-256: ffcb0848388a39d5c3644b546c4bf312e366a707edca06f2e194830beeaf0a34
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and embedded clickable links. The heuristics indicate it's designed to trick users into visiting external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely leading to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=all+the+guitar+chords+pdf PDF link annotation
    • http://china-miyaco.com/img/file/202196161217.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/weduto.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/rasedasifuditomit.pdfIn PDF document text
    • http://didula.com/img/file/wiparimit.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/21819627654.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/49972529230.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/77094027469.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/70747977115.pdfIn PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/35794340767.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c282622663---57370639407.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614db2bd51da4---rurewuwexekolubejed.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/4672618465.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/pogodoxekakopuzolalubo.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/47371990854.pdfIn PDF document text
    • http://vln.nl/files/file/xisabafaxijosafivulupigew.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/fevazezawerasupalevexuxu.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/nemevojumiw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2baf93bf9---rikurepepidanulatubus.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bu1vgkvk20m5ts3bj44h4tr4p/tutoloxozesozu.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/lamaxumibidadake.pdfIn PDF document text
    • http://bastola.org/userfiles/file/92136212984.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/pomaxo.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/82735183410.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_off0000ad90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 10876 bytes
SHA-256: 0ee2988adb60e6a6056dc7d00db257c82f028c9cb616866ed5ae0a23b2d6a8dd
font_02_sfnt_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 14072 bytes
SHA-256: 037416fe68919c99d3120e0fae1b8bb3bfd44f86ca7173356ac6b836ae6f1526

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