Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a57b7dcdee23c8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 73baf535800e6bbf7550fde888bf9454 SHA-1: 1e3e43beb5da1c0d30ba83ada459359c38bdcb51 SHA-256: 57a57b7dcdee23c8e7b03b46c3082b72b0cf1721dd6f6a7b79cc440a65a0e622
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://rayer.cn/d/files/tezosawibafewixemu.pdf In PDF document text
    • http://shinies.ru/img/lib/file/57471482653.pdfIn PDF document text
    • https://onwater.my/uploads/file/32066514463.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/716470618bcf719823b5d3ffa6ceb91c/xiwixumebabid.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161271087726a1---34858173845.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/22969260450.pdfIn PDF document text
    • https://tavio.ru/files/file/47283099814.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/roxaloje.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/90288186491.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1bdf9ea7dc16b78b1da1b8bd62e1ccb7/viximenakabalemakegitego.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/6871410543.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ecfce3d3---tupogoniloxi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0a467d9a---fevuwor.pdfIn PDF document text
    • http://yjccnc.com/upload/files/tupifakavasoj.pdfIn PDF document text
    • https://onecre.com/images/content/files/junenadutazuv.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/98079028013.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/96323965258.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607917b1591a4---73488259051.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/86802477920.pdfIn PDF document text
    • http://gptools.net/userfiles/file/pakamiwap.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/dumumezopodesirubarupu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8bb550499acaa20b97aa5b26a7503f23/getidafonapotagi.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/werazimizexovibunaje.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27b063bfa---35316614857.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/41330512381.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0632aaeebe730c1e252937a189fd4050/62162959604.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/78461245503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=datetime+from+timestampPDF 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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 10368 bytes
SHA-256: d26e1775915be62969e591c5f88a1d2a23fddc5766fa2f1c2cfd71977e0e20ff
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 17524 bytes
SHA-256: 7cdb4e2a2432844672042e5296887a9b2efddf3d7b2eea723500ae82f338695f
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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