Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f23736ba7fb69f…

MALICIOUS

PDF

95.5 KB Created: 2021-09-08 04:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1426bad822426024bfd1c67a385dcb55 SHA-1: be50fa41b338393ee7aa9841e81e5fa07ccb4058 SHA-256: 77f23736ba7fb69fe8e7e3b8b6ee4e81faa0af03523e336cfdfe7761166a5782
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious files. The presence of embedded JavaScript, though not directly analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or initiating further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfae22e64---lenav.pdf In PDF document text
    • http://morgancountyoh.com/userimages/setikum.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/poxane.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/pubikejerufosikamone.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/pamupofalidimadug.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/11292280299.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/minimep.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/44305503481.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/19188443914.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/75517777027.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/vesapepajirewa.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1480ddc02b---niserukigumituvumoba.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40017c1b03---xepej.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/330561b77a317b96c9b16dd46ad314f1/xuwarofusogizafexonewuwe.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gejov.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/xelodovimevezalituzizawuk.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108131447457446.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/4552877007.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/10979127388.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zexixowodanoxivulo.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/vimusumasunazasukuz.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/lmr1qlauallhpug5u0mifuof3u/sejonuwenafodusifavol.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/tetamajigarunatimeweropu.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/16145350873.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/21836985691.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389e7b580b---zotanirarasivupiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dolce+gusto+mini+me+service+manualPDF 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_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001239c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 19532 bytes
SHA-256: e7a951c16219f07a5c23621bc492d8bc0ed1d31c794b869b3dc47f7256d1cd44
font_02_sfnt_off0001573a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573A 10740 bytes
SHA-256: eab26182f3d2ee231529da69ede0223e2a53467689f7051b3b68080727874083