Malicious PDF — malware analysis report

Static analysis result for SHA-256 247a3c42905ec651…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 06:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eea895a95700978b076ec98f8972f062 SHA-1: ab52ef8af6dfa017b719619f50e3cdcebb0fad51 SHA-256: 247a3c42905ec65180c9dd2a8ef69eadf0f145be372d448b2924fa7e5691a1cd
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ClamAV detection as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6bb643a8dbebba92c4270326cdc3695c/96222748304.pdf In PDF document text
    • http://aostavet.it/userfiles/files/43244715085.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210726_CA24016A9B5E2BAE.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe3bd14db---21131741435.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/debamudebowefurisowi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090760ed767b---8398540033.pdfIn PDF document text
    • http://topp.pl/_topp/file/28673307447.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6cd280952cd3173bd44c6cbfbab4692b/dizaxenexokibolowime.pdfIn PDF document text
    • https://hgb.se/filer/file/90544742794.pdfIn PDF document text
    • http://myphamasia.net/upload/files/bajitof.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/72113859230.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/83263832560.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/nagiwuwujevasapi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/o02trvnolih4jmcsj46o203vi2/9816035043.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/duvugusu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210831130242232.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/077kid2a58jlrvi439ohp9v6m3/filatezisowumul.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107281558361710.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/62197284457.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb44c25bb7---ziwejotetalozefefup.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/sovusokivafuzazixezoz.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/89109264698.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/sawesefuxolofojomosagifit.pdfIn PDF document text
    • https://derfo.info/resimler/files/33746623278.pdfIn PDF document text
    • https://mavibusiness.it/file/gopuxisobevo.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/98572851383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=humvee+pmcs+manualPDF 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_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 17832 bytes
SHA-256: e0c3038534a8db5d9829e32ec429c73d724aef1992ff6ab7f1efac86e0a34f90
font_02_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10280 bytes
SHA-256: a037562df0e38144b1d6c10a574eefc3787b2370c7d240219c701d078c743a02

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