Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c38c32307997d3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 05:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7700dbd609c77d71dbcbab9a408fe112 SHA-1: 372312ceb9051d6e50c8ee8e260ec7961e785fb3 SHA-256: a8c38c32307997d3e1f85ccc80964b2957abfd29481dca00b349285e1cbf1ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ccsl.asia/files/taxozebude.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/pafukexawu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5187865e63---bezudowuzofufif.pdfIn PDF document text
    • http://dzbnf.com/upload/file///vexiji.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/vexukizepumukowe.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/67865330104.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/30417627692.pdfIn PDF document text
    • https://nasikampung.info/contents//files/41853653826.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de7724a69---xenapofivedudobujojujajox.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/bitimobogegiturosutoxa.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/jubedulutazazufaz.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/kibigadenasoxatabujiwa.pdfIn PDF document text
    • https://luminex.pl/upload/file/rijipizukadijemebob.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b4f701b1b6ffe72a8a584812956db88e/desux.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/4869467646.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc522c04a22---27692112480.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5a4c831---70401719403.pdfIn PDF document text
    • https://zd-zeta.com/uploads//files/202108110011558762.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e002be24b83---kekopetawexasam.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071263d00e80---zebejaf.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/12602310206.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/35494114282.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/volepadadowuwiketipimodi.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/makametiwerutibefotixaz.pdfIn PDF document text
    • http://remobudostol.pl/pliki/kewezalifejixobetezuvuxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=deep+learning+stock+market+pdfPDF link annotation
    • 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_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 18716 bytes
SHA-256: 1118435c1f0d3e9ad4afdd9d45a8ba2c1dfd5c66cd5367fffa9ebde87b094a74
font_02_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 11056 bytes
SHA-256: 3c1b0c34ef1ceff87fb1091fce162eded0252162f5d1ea3878f9659e081413f1

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