Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71aa9a8c5de2e15…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 03:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61f6996fd10a19b940cc00059273b549 SHA-1: b78cf25348a8d0fa1370afd8f2c2c4d14ce5cd14 SHA-256: e71aa9a8c5de2e15592c0b8d6690cf488f15c791a2f9a3cc27a07836daf6b29d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hrmconsulting.biz/upload/files/zusanaladumobumajeze.pdf In PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/jexutoranazivim.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/04062ec84408eda6c07aded8d4661115/57852370967.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097acdb91258---zumodenujimojaz.pdfIn PDF document text
    • https://shibbirs.com/media/files/66338026785.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/21922916778.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/dafebiwek.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/dovaduxanod.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/19075875972.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kitodajif.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/lovosudomiwoxoduvew.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/nibig.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/41725568877.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/a0a50d8e2ea9ba90d602c4c38196b6d8/kojarepujifu.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/boganutekinizoxe.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/vajimasefan.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/sugopaledatavinutat.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gusupezofamojexigok.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/92828780315.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/dba5c705a3d75963e6fa7c4e3ffcf8c7/77532815794.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9fe91e7b161aaed6c438a9c97bf4e380/detufevinixodinukunu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/46ad1a5f6a5434aee4d3549cfc7f606f/zereb.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627907936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=plant+structure+and+function+worksheet+4th+gradePDF 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_off0000c10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10F 11112 bytes
SHA-256: 513dd3025e7d1c0682044d51350958ccfed8de86f32fa9428f77a2a4a5c2043e
font_01_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 17592 bytes
SHA-256: 007c440766bf8bb78a8545a7d37f296510c2091507f8a0a0dff6f0a45074036a
font_02_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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