Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6271b8c176ed022…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 10:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f831d87a5a5155ab11c2c982cc2b5955 SHA-1: 4f757264c2b541f994c04a9609c35f2858f6ee68 SHA-256: f6271b8c176ed02249f0e01b11abc3dc931f284138de3abd5ef5f1d24ed4610b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a266d0f9781cfbc7419d8a7aa6e81793/waxefozadevegakujataro.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c0eb61b9e4b42828d7859647d573f373/zalebibav.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/mezemapidotitev.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ik3voatn8jnppd36bgprru7ah6/rifimiwejesotedafog.pdfIn PDF document text
    • https://pixel.bg/img/file/xogugevezanuzinemajaj.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/94679662820.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/tujatazila.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/6fd44678253c512d767f23eb072d6294/fepipavuwakop.pdfIn PDF document text
    • http://mq-water.net/upload/ziwosasurupilozo.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/9333100226.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/gafojurumixanosen.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096ff2186304---majokepugijopovexinasexam.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/64548475520.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb902caa1---74352017083.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5f6d3b4e159096ec1ee0c0890fcf9db8/73653706383.pdfIn PDF document text
    • https://unosms.us/userfiles/file/77123570862.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dbhv392nqoib1qjfssp2p48rs5/waxufesutetizo.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/sezetuxinekoruvogixux.pdfIn PDF document text
    • https://atavio.ru/files/file/29915023581.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/65411216449.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/43476947966.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/fozunitujafolu.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/jilugozodowoxemumemupomi.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/29404034871.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/redabuvuvobuwapidekusodi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4ccea4e1---fadipevumofuzowux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+printable+comprehension+worksheets+for+1st+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_off0000c6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AE 16064 bytes
SHA-256: 37970ccff4fb547d92ab1914f728e84f0ab65ade32df3aa76fed8c9c86d3c777
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 11412 bytes
SHA-256: 182ba52ea6f7f87dec578971775cfb224dd0ddd2bafa73fb35a967f41be58727

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