Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc079b79c32ee5d0…

MALICIOUS

PDF

116.1 KB Created: 2021-09-15 15:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff071c08a5b3e8fb362402ce8ae68130 SHA-1: 477ce331cb5190f73799f032cf3bae0fff36525d SHA-256: bc079b79c32ee5d0ca84c511f5a751fe9ae4e31ba339f6139374748bcc982a95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=rich+dad+poor+dad+pdf+2019 PDF link annotation
    • http://antifftech.com/uploadfile/file///2021090916294028.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7248a2b1b---92335876151.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/3244479899.pdfIn PDF document text
    • http://kelvista.lt/images/files/bubutemudukusefivif.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614044ff854f6---69420045984.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4c00a1054e526bb4d1c77ba7b628eec1/suxafupelovujunuwawu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2742ff7286eba1c67825bb7fd3e96406/sorofutuxu.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/46601892648.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/dakodujifekasovuk.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/55797661331.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/81647396047.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/65677313192.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/kixapapodowenesufedene.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30968138043.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137953a09c79---sogopapave.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/niruv.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/sukixovukasu.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/26300868514.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614145e723dec---50076315283.pdfIn PDF document text
    • http://mousike.it/img_ins/files/luwizusemew.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f216ab237---wutixovuf.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/xejized.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/53982677150.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_off0001611c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001792e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1792E 18588 bytes
SHA-256: f9803376e394ecfd8d5f12c72c0947ae5596bd89b6ab485365c70de5764579c2
font_02_sfnt_off0001a9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9E7 10676 bytes
SHA-256: 4013976dd24632ca0f16b3aa359aa21e3e037648207cd25a5413b14777b427f7

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