Malicious PDF — malware analysis report

Static analysis result for SHA-256 d547be0385a00154…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 15:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ad23d2c5237c072346016b283119695 SHA-1: 3851f4eb488103be7feb9d2469c82a374c573d26 SHA-256: d547be0385a001545821de2d3b726fa5de2160d0c614da70d30c7b01f3ef2be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted from this sample, but the extensive use of external links indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=coartacion+de+aorta+en+recien+nacidos+pdf PDF link annotation
    • https://alakharia.com/public_html/userfiles/file/bolujipota.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///29659539468.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/jorudilasufurolofewamibup.pdfIn PDF document text
    • http://metallpress.ru/files/mijur.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/xesebugavozomiweki.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160849211e348d---9225703949.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/56124774290.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/08ece94bef0a61b34412ee2039f9f0eb/murufugubofogelogema.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9c4255eb535ce38098a212a2901f4c02/77057312295.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/sisinur.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/tojagijowawonib.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/latigumenapixiti.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/sikorakenopigitadusobowup.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/5980941735.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160899aa3b9822---vefugozobilezosof.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/70450866666.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160974477e43fb---65905698069.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2dfbaace---vuxojuze.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/esu44cdibs9lpfp6ce6fjvtfl2/85962524569.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5f1f29ba---disaxuniwulotoxa.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/zorul.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_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 18516 bytes
SHA-256: 14a4abeb2d2ca63b39b9576ab3d98aafb0b473375be87d0ac95c16c40d6e5115
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 10596 bytes
SHA-256: 21639f9c766f1d587f9b9910cfab28166036ed00cfe8baf1a379cf1be29579c6

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