Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53eded68dfbd692…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 08:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e653ecb2548cf70bd7195f3de44babb2 SHA-1: eb22faae253e8c6320d184662c7ffed71ca00b23 SHA-256: c53eded68dfbd6928290b7ad203e8e1cf97317c1ab9a5cf69179b792972a772a
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 websites or disposable domains, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=harga+avanza+2011+type+g+manual PDF link annotation
    • http://greece-ex.com/images/blog//file/64213267398.pdfIn PDF document text
    • http://skupka23.ru/upload/m/78645032425.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/5266309042.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/94375385893.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/71881962969.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/3912015530.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ecc1119c---70417242745.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210730_021817.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1e4a3fb9---649100333.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/zotadivaguwinoposog.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214f7a8ea5---vuzowodabilorisesuxupopuw.pdfIn PDF document text
    • http://wernitznigg.at/files/62476017264.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f24a7c5d03---67284895345.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9dk5fb0mgi24r09nfbeq83jb21/vilado.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/66e3d039a57a53fdbb1c23476b54427f/wosogujijowosidowagudov.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55fc9617ba---84085303619.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/23985579126.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087139acf2f3---65918514911.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d9f7c376---gunotiburuwipop.pdfIn PDF document text
    • http://beateromer.com/bilder/file/benezawejidezavalinez.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b6b21474---jonajalurizu.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/wenuwolekuresirowupozona.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd22f859f5---85743026096.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/76529324794.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/59857401725.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0rq7ohnmads0ka857gc48un2vr/bigunulojikamololusirep.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_off0000c42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42C 17000 bytes
SHA-256: 9a068579ea9ce4c6e5ef821b61016b5a07a892842911b6b333df308be94170cb
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10840 bytes
SHA-256: 73b29c12f5c5cb5a2993eaed10530f9d23d5efac80345b7efd38933b13226378

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