Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42cc4764e91817c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 12:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5df28045b5a94b73b245efc9d50d4eb0 SHA-1: 50055dd080108356d2aea7a7c1a731427144abb3 SHA-256: c42cc4764e91817c071be4c72884f73bc023eaf288ed1a777f1e329f210037f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure itself are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=ancient+china+government+type PDF link annotation
    • http://magic-mugs-factory.com/uploadfile/files/fodamisobiwoditeloxuwi.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/6551408887.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fegilivejolakesimamo.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/84071573728.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/4a7v5dmp9omhid5squ4jjfn0e0/2101909614.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5ed412e5c814937b067b3e1433b0c7c1/20422711575.pdfIn PDF document text
    • http://usmleworkout.com/files/file/kazutitebenogur.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445c6acd6ab---91141372449.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/rotikigemev.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/62010038434.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/wevixijerizuxib.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/50646796917.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/62891125047.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/xavinuwixusomiremok.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/25805432259.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3f74351f5---51338504884.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/bowigidovupu.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/43441404854.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/88752711441.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/99293339654.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/wewobiwoniparilizojut.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/55777706150.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/morimodipi.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_off0000bced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 10768 bytes
SHA-256: 0a5722eb2e07586a3f4f35b20704368978bddd394bbfdc985e2095d1418b2b41
font_01_sfnt_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 19580 bytes
SHA-256: da00dc82ca15d1629d258d29e0dcd9182d2d3d6f69114a1eec44aaca35c7734e
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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