Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b14933ce36e8b8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 07:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a99cb84927d606fe50a9c10737c4405f SHA-1: 13a5730a7fb64da17a8e9ece198ae5133134e9e9 SHA-256: a3b14933ce36e8b82f0a25f9558b23f5c38de1af13ac47b5725faa98c87ac444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://namkhoabacninh.com/images/files/gadopovosonafaba.pdf In PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/49219593132.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/70516492933.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109052146422985.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/famikobixebejafibosapago.pdfIn PDF document text
    • http://ranch.pl/files/file/bivarabafetomer.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/7879230985.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/gitozutetomamugepe.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wodulo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16146c88b9fa66---80353567184.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/woxisitogizap.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/gixogewovimupunad.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/sowusopevogipab.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/42826257798.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e47e47ae29f85aaec98e3413d446d951/xibuzelexanuv.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/popojosirusoxijaburuvov.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/dikoxuvela.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/vuxisiwejeboka.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/xavisugapo.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/28637125609.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16130036d8bd1b---dejorevidenapoxadofusex.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8b0ee10b---31197259035.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/patuzuki.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/nunedegoledizeli.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/51057493107.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/dusisibivezedelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=stream+from+phone+to+chromecastPDF 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_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 10680 bytes
SHA-256: 0def076cf5eb7710a279a863cc661e91abc4ea1179d079ca15cc5b5208d6e8d1
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 17584 bytes
SHA-256: cac9bc30cce8379a9a063f2b61454ef8762363e0330f2b4e945eaa3c2f00a12f
font_02_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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