Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23073b8768e365c…

MALICIOUS

PDF

90.6 KB Created: 2021-09-16 16:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c33d83bc3ce5ed8eedd236205d19fb9 SHA-1: 844857c77418a08e287fd6bfa8f473dc2a7499aa SHA-256: a23073b8768e365c2af765dc31a4cfa4c6ed2ee9f18bc60e720549ff3ef49200
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 WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rotarycochinharbour.org/ci/userfiles/files/342851882.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/48964055619.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/22199815853.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/37156633586.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/2234463850.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tagikuloj.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/90573586090.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/gugoxipasexovofakofef.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/bodegoziruv.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/80074237586.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/futegazevuxikagamiruso.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/bawenosaj.pdfIn PDF document text
    • https://digireg.si/upload/tujasapiwepizolame.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/kogug.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911140310.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139591227bfe---71111892691.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/26752131961.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/82194156943.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d50e896ca---wuzegelibaxuzuwatob.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/22887875555.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161309224c6056---4503202469.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xupuzefikadinija.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/16304389199.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/85537667434.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/80330007024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ace+player+androidPDF 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_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 17680 bytes
SHA-256: 8eca9566e4be4685f7d53f88dbbe71b893b51196f6de131b73583daa985579de
font_01_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 10336 bytes
SHA-256: 6bc2718de8fbb64a4d535dc963896c8e4771d82d0243e2d98223ebd37b028e13
font_02_sfnt_off0001448a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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