Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70cbf4ace7bbbe6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 16:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7bfa00dac4d51daac094c8b45612d95 SHA-1: b8544dfa2335225b0601421c086b4c14afa236a9 SHA-256: a70cbf4ace7bbbe61e9c8c556ae1a9df6016e35ec2fb223596c230c70f3919a2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of multiple external URIs, including links to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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 http://ats-dz.com/userfiles/file/lipisokoros.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06983efd2---89815771916.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/pufenatoxebaloxakulo.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/metumutamuvigaf.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/wivoperirurubiduvu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/16d3f431d1e8b308be9ce9f8cae3e08a/tofeviloxotisimebigive.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/5760624940.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/dogetinomudezifugejoj.pdfIn PDF document text
    • http://orderkai.com/uploads/files/vudaradoganugejaw.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/28668539473.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/pavarovi.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/forisafodofuma.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/42800551364.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613612dd9f997---93764064957.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/57442213546.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/54788524136.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/44023699097.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/98565011652.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/mirubuxagep.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/sadikeduw.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/ninurez.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/49058906884.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0ca2a551efafe18eb4a79be7c22a9533/30865613163.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/vinog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+future+of+life+edward+o+wilson+pdfPDF 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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 10744 bytes
SHA-256: a0d590a0fbb5a010d08b74e40501504e9e6eec35da3b02fc6e46eebb74d7944d
font_01_sfnt_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 16348 bytes
SHA-256: 8b36cc6680ce83b431837c7caaca618af701a33fc7902bb7febd9242a3f07363
font_02_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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