Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2411c1c809694f…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 00:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 518689e87faee44d0983e6eb9992af69 SHA-1: e5937079ab7e0e8ae7fcbf122e8a83fd5fc945ee SHA-256: de2411c1c809694fac386c09ba93f803caecd9a333c7b6c2f92d679c9ea816f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://oniceh.ru/uplcv?utm_term=wallpaper+options+android PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148eea9773aa---zusepoxererijivip.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/22013795908.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/24922167337.pdfIn PDF document text
    • https://best-label.com/upload/files/98603634155.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6d24e485---manude.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/nigekidibepulupa.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/89262474278.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/xedilani.pdfIn PDF document text
    • https://bloc-immo.com/images/vavugibadeke.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/telawudekiligasebeletesi.pdfIn PDF document text
    • http://tiquital.com/documentos/file/77685508394.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16155ae05a4623---93952373209.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/lisamoxajufidebeliluba.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/65163907370.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/21595585337.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/73684170075.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/69943653216.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/61742294771.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/57799211571.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/65962060961.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ac200bc270b6fb755f60529e057001ae/78689749098.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/sesopinukirezazanimij.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/53988724011.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/gasudinubuzekuperi.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/pukemujugatowefoxi.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/12822755539.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_off0000b3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A9 10380 bytes
SHA-256: 7f01acd74cae82fa167b8083fb307369154ef757ef708916411f3482427937ae
font_01_sfnt_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 16720 bytes
SHA-256: 3f94c3afa2f095de5c6ec37657bf4d1c6d3ca8e79943e2f659e3bfef12ab30d4
font_02_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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