Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ba62157d8e5161…

MALICIOUS

PDF

73.1 KB Created: 2021-10-06 06:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5f9770462510c72ce20c6cf79e7be550 SHA-1: 3e2e753da29a10c7dab23388751941ebfae8a81a SHA-256: 26ba62157d8e516156072349239bb6196c995b4dc7731d72a2786bbb4e70ab73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on non-clustered, disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection or download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=how+to+draw+cute+things+step+by+step PDF link annotation
    • http://tetrafluoro.com/upload/files/nuzinavadelikekunasubu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/sizifidakokogovumuliruf.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/442f13da0b79310c6b7d4a65914e3ad9/dodolexizekiz.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/22426434056.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614faef71b764---zavipizekibejij.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081137582858.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bkfup74mknaj9m86i37jrr5tnl/90497423960.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/tosoxagoxibus.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/12542011737.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/pinovededevepixaduwu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/84169126223.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/45026071851.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/teluwazujaresajiwimof.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/80435117092.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7bd1ef69bfddafa4ab10f2eb4f80b2c6/vidijib.pdfIn PDF document text
    • https://rippa.pt/files/file/18005975207.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaf1ca9e47---janunuxaponapejafijomif.pdfIn PDF document text
    • http://methese.com/upload/files/seratanuparozekejizijino.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/45566121370.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/niwifopukutafekominepap.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/parokexiza.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/71e9d5d72e660d44e75acc7cdede690c/17217585525.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/36385279193.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/jepobunagovobejerarag.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-04/2d06d8bc765b1f831f4f0c4bf98438a8.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_off0000b955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 11180 bytes
SHA-256: 0de953bd2c81b708774de1ac6ab3a924ba172b3e4e7f6f3124629e428288d5f5
font_02_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 16840 bytes
SHA-256: 6712f054d02d6e31adf515a95b68958d27b7730f558f078de8b10f7d762319cf

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