Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcc5545c7086c31…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 10:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ecac56695fa2c5f432669e72e866cd1 SHA-1: ed3680459c777dd4ad1e41d2c0555a588c61ba7e SHA-256: efcc5545c7086c3194200aca99ea57efff58f8fcce335cd8d1dd460724fdb46c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=office+management+text+book+pdf PDF link annotation
    • http://phuclocvienjsc.com/uploads/image/files/20447800707.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofivujimefutopipij.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/luwawagomovaxivisidoberoz.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/42829461611.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/rubajisare.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450cfd85b9---kebafu.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/68228022779.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/pazewejujedubamojos.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/divetakurodewupuve.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/67448886412.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d853b2d1eb1---semagazemesowivezedi.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/57499884885.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/53052096322.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b216d739119---pojewikefijitajapine.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/jubimikofiti.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fovegikek.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/34094343455.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/92473344169.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/ripifoniwenipuxukesinu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/t8birikuj1f9ku9mst2lturas3/75902570741.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9mpjtl5q14f0viutl317jl08sg/sumeju.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a943d05f4---83834048930.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/952a5b505133e20a920b74f5adb9ec3f/42812839102.pdfIn PDF document text
    • https://hirurgija.me/files/81570571191.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/dobibitevepi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2uu82l6n87la6u8hb5iep3p35/befokezezupirivadimomip.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_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 11008 bytes
SHA-256: 42ea36f8cc5df6d42eafd7b68bc37bf1ac62819792658f3292b3502008153faf
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 17160 bytes
SHA-256: 28116c6e32d7bdd027264e1ba637d61518e4bfe1f5458de1add1d5d5634f37a5
font_02_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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