Malicious PDF — malware analysis report

Static analysis result for SHA-256 4143a95bf3d131fc…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 09:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6c880e01f0517e87f788c7e82208562 SHA-1: 2fe668407aade74af94f98244a4850a99a5f1bf8 SHA-256: 4143a95bf3d131fce989101e4448ad69567a6a27fef24a237f133b1144bd4d8e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=watch+the+suite+life+of+zack+and+cody+online+free PDF link annotation
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/565a8b627c7fcb06c9ed7bdf08218aae/79748793899.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/26792794666.pdfPDF link annotation
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed332cc232---wazetenixunegetugopifoj.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/jarubuworewutom.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/wusivi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/78bg93nrglv4huro2ag07frvg1/17341072413.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/tumugum.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/pigav.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/47192170914.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/83309716355.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/rinobuvimidipodekibine.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15b41fe39---zezidowifez.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/20351272930.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3511f2c9---vikutodikotupatananejesa.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0f462f5bd204c1981301716386b7dab6/felimavotokeligafur.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ujlaggk83smkrgrve0grb8up4/90811004732.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/kujupikuraneg.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/letowep.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608044c88baed---72859668117.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a14cb59a38ff93eb14be80635a618433/49994602423.pdfIn PDF document text
    • https://anjingliar.com/contents/files/46066590272.pdfIn PDF document text
    • http://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/lofabulebuxuvugis.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/kimiwovupufudesemori.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/51363629536.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_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 17588 bytes
SHA-256: 328d87538550b6811a889f65c4dd0912de96fa08c6aa3ec44db87f415d1d38bf
font_01_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 10932 bytes
SHA-256: a52800055233de5191b4348f0b1a4a02ad0cc2739c05c9a467330add6c437f2f
font_02_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1