Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3b9c9524bd1de8…

MALICIOUS

PDF

86.9 KB Created: 2021-08-30 10:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d86c85c17327a27e2f73b9517513da4 SHA-1: 18d6f28a55623840a5c22584f29fdf20eccae4d8 SHA-256: ef3b9c9524bd1de8c874c30494380614d86f229fd19171be0aff90fe485aae07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a tactic to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=sims+4+domestic+violence+mod PDF link annotation
    • http://tamker.hu/userfiles/file/54986438028.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b356e5ba42e---44619471045.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/88918543504.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f17c1189e---81131754585.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/84505367524.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tc8eanb8k931fpfhulnj6sr1q7/wanutekezenifozuripividu.pdfIn PDF document text
    • http://pinxedien.net/upload/files/56647676071.pdfIn PDF document text
    • http://tipiland.net/upload/file/vukamaverobosadit.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/29044407701.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/23117445519.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/92277992078.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/50368581937.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca093d2381---48233716017.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/bogopesofokegi.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/05a89e2af5d6320538b3471aa27e4a83/sikulu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cc9058f4---8611994526.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/5352245053.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107241747024122.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608367745ae7e---tebuvi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/79bda6c47d556b3e0f1130736e5c8bba/gosadojagavojasefegudizar.pdfIn PDF document text
    • https://noddy.nu/images/file/mojuperatugopaw.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/25136786954.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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 10488 bytes
SHA-256: eab8242fcc5c706a30509f9ebeef033208a2297dc370856861c517a25e546e1c
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 18180 bytes
SHA-256: 4071ebe3b2bdd9a7cd25f98e6b2cd73e59d3e1801d8a9c397adc0e04d96e6f5d

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