Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34460d0c1231e3c…

MALICIOUS

PDF

97.7 KB Created: 2021-08-26 11:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0baa5c13f8d9ca8c4e62d653149fd021 SHA-1: 1c418649b349c7fdd0e989d83fc7fff2d96b6e95 SHA-256: b34460d0c1231e3c5a9e04414a4e283f784a6417ded318d41e4c8adc756cf3f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, forming a link farm. These links likely direct users to phishing websites, as suggested by the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM'. The embedded JavaScript may be used to further obfuscate the malicious intent or facilitate the redirection.

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://krisoc.ru/uplcv?utm_term=only+one+color+but+not+one+size+riddle+answer PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d80dce4c5e---lekigixusenivupaxe.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/85840273507.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/pitewemopojitifol.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dd721ce3548---93005858849.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/76010935659.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608371a027ad9---kivatikekawurenuvuk.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/riposumalusulusisiwolit.pdfIn PDF document text
    • http://abpaluso.com/upload/file/mopolozi.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/tefutu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab9d8b11f---zudarajufozekizute.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5c116dcdd5795e42a3861f7e01a05a01/gidesek.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/gumilege.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/cbf12a46f4b7c2999bfc4cb105a37d2c/16367095542.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5a18ae0b---xomamuguzozej.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/43251639312.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/senezegovonadetejaxoraf.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4igca45htdmu21vpd4huqfa8ii/runatewadig.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ebdd77f4---jutosojitamubosibokazati.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cd3b96e5d7---91337672980.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k5v4npmm74o1vv340oo7r6g8cc/40868530682.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/kosikotevid.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/63659398199.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/subeponogaxis.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/simovajuzewaguxiruf.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/40857223497.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_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 19312 bytes
SHA-256: c72da3465f867342f54fa1e073d50262a1e16b3fa0d12abff514af599196b763
font_01_sfnt_off00014415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2C 10888 bytes
SHA-256: f5f4ec286be2e71ac2f71f427450b2ce501794548a101df9f7928e6117fb23ca

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