Malicious PDF — malware analysis report

Static analysis result for SHA-256 64463ebd5df68683…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 21:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 428d57f8eddfbcddffea26004bb64a28 SHA-1: 191c280eb698dd4bf2f3f0888ed7adf9b50bbb6f SHA-256: 64463ebd5df6868319eb146090e8f89420ba7b87100148f84a2781efe3ee3173
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO poisoning or phishing. The ML classifier strongly indicated maliciousness. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious content, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=magix+movie+edit+pro+manual+pdf PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mrt55oebu3hbi414qb90pjarre/2841546401.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/32708413087.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ulhkpbkcebo6k404ptqp675i29/febopugakibegabazetilogit.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b310e4addccddbc7bc8396ae02b00d06/64564134566.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/xusopipolif.pdfIn PDF document text
    • https://ienter.bg/files/tepufifozusadotuvulodeva.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/kebuji.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/gukegarozopibazowe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b8f8bbe8---gomofam.pdfIn PDF document text
    • http://ksmt.edu.np/assets/ckfinder/userfiles/files/bulasakufaberalomudepugo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bad425a3689---11053942818.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/6bf9274d4aff1875910679b2f726d2ea/lumepuno.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/20631536922.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/85523460444.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8d86faaa---91544854741.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105790c601---54823515270.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c974a865---17690066071.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/nazadafopum.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/dokevab.pdfIn PDF document text
    • https://digireg.se/upload/rafaxepimepibuduvisumukor.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/9148684798.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf000420eb---98732956140.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/zezafubotamelefirimut.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/kifefekukavezevevikujovi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d368633924---bulikopa.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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 17788 bytes
SHA-256: a608b637501021ba51e1ed8c57c73614ba8b9b402072d48264f9382a481f806a
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 10932 bytes
SHA-256: f174d182be09047cb944e30a6728c7bfb76eeac0104ca86b7033fc57034caa53

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