Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ee59c45b866bef…

MALICIOUS

PDF

92.9 KB Created: 2021-09-18 22:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d0efebcb9c8a0e4b6203ab3ca85bed1 SHA-1: bc7cf9ae04a539b8679ce42a33ef096e25bf92b6 SHA-256: f0ee59c45b866bef417ce63a20e04292f4dd2cc63293c053756aed1d4619fd59
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or facilitate phishing by redirecting users to malicious sites. The embedded JavaScript may be used to further exploit vulnerabilities or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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 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.
  • 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://ketchas.ru/uplcv?utm_term=123movies+watch+hd+movies PDF link annotation
    • http://conhantaoankhanh.com/webroot/img/files/gosadiparozajigog.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/kuxejizakekumewiji.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02914504b---ludopejedakomebaf.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d510198f46---76602800215.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/22041729047.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/semakunuzudus.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/46867146147.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b616e2a235---68104867196.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/44051400761380fce93a20.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/pelosavoleforejimadutinu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/tinavikosojatarej.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/63934427949.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/kijetibesikeb.pdfIn PDF document text
    • http://friulanapanini.com/images/file/18211158940.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161432a6d2358b---dutapataretuzufejiv.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/38410229145.pdfIn PDF document text
    • https://geniodelweb.com/file/59539577394.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/5533730513.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/niliwesikalokafujebuziv.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0865f3833---napewazokusuwixe.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/bca506b8419836ec9e68fc6346e71b31/bagazamozivaxoxarolase.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/kalavuzamiwalamala.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/4436696355.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/dutetudatewonulegojoduxos.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_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10784 bytes
SHA-256: b4dc60bbd63514482e6bb89b6eb9c8b205b2e731dce77a023869ea45c706951c
font_01_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 19056 bytes
SHA-256: b7ecb1bbb8eb20fb40dcd3a65a20fa48ca42c992528523bfb8b216abd3f06e85
font_02_sfnt_off00014d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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