Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca58ec7c1a0bae2c…

MALICIOUS

PDF

82.4 KB Created: 2021-10-08 00:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4f8b6debc33daa0a34d75671cbc38870 SHA-1: 43be853e1438c04610cf95f02bcb252f9b376b26 SHA-256: ca58ec7c1a0bae2ce24e98cad824063a24c5c32982e49e879b5b8427b9432b3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple link farm URLs, some hosted on compromised or disposable domains, further suggests a phishing or malware distribution attempt. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://reichspfarrer.sk/file/17494325694.pdf In PDF document text
    • https://matfreklam.com/calisma2/files/uploads/70505508052.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/98356228158.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613238ce28325---77140749759.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/90416912806.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/69325dc640a60c4aeccb67da047a266e/89498246435.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/faxadivebavow.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/daxuwopimufuvezi.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/17224112241.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/masomi.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/kisupexe.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/73174798437.pdfIn PDF document text
    • http://hak-al.com/resimler/files/52209135898.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/duguwatif.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/69276045499.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/7233891508.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613984526eb71---tudefapaxuxugub.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/gosewokenawemo.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/9547877160.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/72055517182.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/94515889740.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/15340698251.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/valuzowebo.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210913_225927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pdf+of+computer+bookPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/49200135514.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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 10540 bytes
SHA-256: c3a4d7f988d1b01a8ead14616ef04d5f488aae2f3aca2153d8c662c26b20612e
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 18020 bytes
SHA-256: bda1b1b407e53e858ec6fc176f5e7f4097d02926f81195651932fc895cab5e55

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