Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cd6432e268c341…

MALICIOUS

PDF

128.9 KB Created: 2021-07-16 08:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b1166f5033def250bcdf4468f3c75ca1 SHA-1: 99dd769a7b9d7fe0b4fd28854ba3d2176ed17b28 SHA-256: 40cd6432e268c341f6560118e84edb9d408e10da8928affac56a1be83970fdb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://bscartridge.com/pic/nozorusinadopip.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b81cfc3ffac83dfdee8e641c9f79d7ae/24065751135.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3708ef7bc58a64da6a681853911c2d08/22668679553.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/20781399320.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aef1eac6---gavizupasume.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd050acbea---26370948491.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/89342365252.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nazirezekazeniv.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/tinidipatekoporufidub.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ef3f759bd61953016ff324f1f77a00cb/89339410716.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/dinixopelekal.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/32789daf6b98cc6198ea05c92dab24ad/28760693421.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1dfd25c72d27baf79c24367449b15983/rezinilimetonitap.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9dbabd02efa423e698cbc242829df492/pipemumovigixokiwewa.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/16/file/20210716_022927_116.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5568767da---wubibirumokejarem.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/favexowinulebobolibupiwis.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/dukawimuzagogorovod.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/totegodirigemuna.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9b0ab292ce7bc5e9743ef1f7386a4291/56200819797.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf1b434bab---65967789869.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccb14d9ee---36860369597.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/wemabeloteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=national+rollout+meaningPDF 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_off000196ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001aed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AED1 10360 bytes
SHA-256: 234172133049fe210907f2a31d3f68b8a6bfa4147ad17f5afc542576124513fc
font_02_sfnt_off0001c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C632 18164 bytes
SHA-256: 3dd7a9d4b7dbcb70a6149be5035d2a792c5ebd7d73ff963d260d8315fe6bf325