Malicious PDF — malware analysis report

Static analysis result for SHA-256 422e611a1834c8b5…

MALICIOUS

PDF

75.6 KB Created: 2021-07-05 03:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8db65458237ef77438f80431b368bc63 SHA-1: a1e960db4aeadbcb7e95350dbc4720fcdd40f497 SHA-256: 422e611a1834c8b5645622a4943c19fb7fb993b9e9a8d901ecb91a471268bc5c
172 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 WordPress sites. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=convert+a+word+document+to+pdf+format PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c88898754---99322095529.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/723422077.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/53308495125.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xuvegegit.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021619347267724.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/7dde026a59b8497c5abddd97fe663467/sozipusadijoso.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/rakewit.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30fc86b3b---61223504598.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b29ecf169---66585317135.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/bf17q993qe2o59hmdrrs5ci1c6/99202263717.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b9091a863---xoxowuzekaxegupij.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/af5ac5f78c1d3264dd4dc524690cb07a/bexogusokuk.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/xutaxotedevuvalofimos.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/tadodova.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6d4961e2314c713979c7b397d3cc44df/jomopizevem.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050102463442.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f6f2ef010---jofipuxuwuroduvar.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/bonolodeda.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870de73d972---tesarifojanuxuzikenit.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/68265580996.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058141b051---50376352772.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/68468423237.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ad5aedb9---mobagibozamek.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/76028101276.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/mitij.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/lakuwiwojapeduzokuzegit.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_off0000c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 16328 bytes
SHA-256: c1f76e9f8afcaef31d01ed104e68ffce7db3de130eaba8f583b7dd5eb98cd091
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 10756 bytes
SHA-256: ebb442704a3ed4cacc67b4b48d92515ef502d7962e2c74aec40dcedbe930328d
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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