Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d158812ffb5b3b…

MALICIOUS

PDF

86.2 KB Created: 2021-08-23 18:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8d5dc916e2b8314dc68a623d8576c1ac SHA-1: 8c93a42451a892498056dcc6c255ae81cdae8fa6 SHA-256: c9d158812ffb5b3b9720fc66f62e1100660c135640757686919f6cc1eeb0ec99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate it is likely intended to exploit PDF vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=4+letter+words+starting+with+ji PDF link annotation
    • http://dedanskecasinoer.dk/userfiles/file/naxenuxawad.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68a923e0c0---45116091038.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/s7d8v4bv88ch8iju4l3o1k9upn/bosupapemosem.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc687090248---59121725506.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/sewebovutin.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/wopifopofefixolazalonixen.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/lasorukemibenaxuk.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/naluzodeduwevulowonuvot.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5e1490f3383f0e23cc93aaf0619a9135/minot.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/25841265011.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609082a03ba00---4682654447.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/wupisupuwug.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/zetoxizanakovuwuvejij.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/31034297567.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2c929d43953a37f0d090b877b1fc09d1/juromokajarusevubu.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/21108678626.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7c9322eeb---selotuvukebivov.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/vewumefozitadosikisesu.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/61303562843.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d68b457b9---18141796007.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ol3h5utbooc3cfmj5su672n73o/26481244262.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qqg2temfah4au2afv1l23jh4ri/48678922627.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/mujoburezomeridokusup.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802d8524e8e---35746268541.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_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 15004 bytes
SHA-256: e132443dc0ead9b2a2ef0e110f721ab56266475049aa82e86f6b0bee54e69e15
font_01_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 10724 bytes
SHA-256: ca9b5884a8ce1db5a11e883b42c5c6d1cc63f2904946c006f67038bcdeb2c137
font_02_sfnt_off000132aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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