Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2287e3b400c83c…

MALICIOUS

PDF

120.1 KB Created: 2021-07-23 17:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 372548a43467decbf9e9439a7e38d23e SHA-1: 81d4cf1365a39a7144201090d2c9f0d41fc9ef27 SHA-256: 9a2287e3b400c83c6bfa4a2fad1a57b5516c74f6e96d2892a26a860b99490c5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9412

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://szyldkj.com/luodan/images/userfiles/file/xolamonaperuxuruneti.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8a83912eb15187675bc7224b91c0fffe/tixejaxunuw.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a567aa99c9feec00bc11eb2f9e9b9b85/41414919534.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c56ed3c4b7ba63a0cb3793d6199ddb67/lipunedewikikarim.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/fekifi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807445c7792---24807798411.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced9bcb123---sijugusisaganukirobid.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/28223720096.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/xididewo.pdfIn PDF document text
    • http://babamoleskine.com/files/file/tuzijopazewesupog.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/p88185o14vr64112819ia26en7/votapironibuv.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/lifesukuparuxino.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a30408282018d7f06673c3ae8d61f3e8/40763124681.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc1eff4007d15cdc70cd11e32ed5eddc/tivusigegupome.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51aa73468---kejalesujusulere.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5785bbeb---19642964983.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/62825753465.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e457d3fa---21030461381.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/7302v6h5vd1pojkb6s1urmguav/fezagus.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2aj88uj8h5qb05n50gurjeei50/jomesad.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dadf24c05---8742054777.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/litefuzuvotono.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcdc1c12c---xonalebirejekibito.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125961952b---17656879622.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lllni1sald3brv13c3qdedb081/93615439138.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/zerapuluguxixix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+3+all+characters+unlockedPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000166d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D0 11248 bytes
SHA-256: feaeb3f8e70eebb25e44ccf502a2bbf9a2dad6276d0e535022f13837de6b9a94
font_02_sfnt_off00018103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18103 2980 bytes
SHA-256: d621d606f304332aa2a533b4db0bd90a18bcb939744ec1f902a4e4d53d443a0a
font_03_sfnt_off00018d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8C 17616 bytes
SHA-256: 69ee175af93d279497335a9959f01c7e4959ceb7cd8ccf4684369a445fb7490d
font_04_sfnt_off0001bb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB40 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd