Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5a30d37f35eb18…

MALICIOUS

PDF

92.1 KB Created: 2021-09-16 21:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d1d7331dd1efbf51fff353da5fee158 SHA-1: 482e343f1e991b1cdf758aad2d099135bc68f7a1 SHA-256: cf5a30d37f35eb180c072c9626ae6d35cbe727ff845e53cb29ebd86b806c347c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm, with many pointing to compromised CMS uploads. The presence of embedded JavaScript, combined with the link farm behavior, suggests an attempt to lure users to malicious content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=101+myths+of+the+bible+pdf+download PDF link annotation
    • http://tnmetalworks.com/images/files/40137928168.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437fcc72657---zexagenesekanusam.pdfIn PDF document text
    • https://quizai.com/uploads/files/rigaxadezatoriz.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/82942890735.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5q07oeicibrl6ns64iubmuo0m6/wugizoro.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/46648573963.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/22841426035.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/kipiwutisolug.pdfIn PDF document text
    • https://actor-conseil.com/files/file/91988254589.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/raxamatigad.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/45276488989.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/diwodosamivuben.pdfIn PDF document text
    • http://mcutech.net/files/ditivuminezawowov.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161371dffc797f---musizuranipipigevudur.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/13129020858.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/83627117335.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/68419005841.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/20805165024.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jukebegagifotabaw.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/veriroxekujelobi.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/mumofe.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_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 11080 bytes
SHA-256: f7bd89944470fd690fdceee5d56d57ca0d031f5f40db43ef5d54ab06103ed43f
font_01_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 18648 bytes
SHA-256: 507264999e885765155257b5de583997d8a58572907ed98809539f2cb62f6134
font_02_sfnt_off00014ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1