Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f18b2ef50f518b…

MALICIOUS

PDF

86.9 KB Created: 2021-08-18 16:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5d1bd1aa9ea1a84d96347d4916813ce SHA-1: 6c08be5bb00317c5c0a88a1157c4023d1da31eac SHA-256: 27f18b2ef50f518b524ff39f5f2d5773370f7996fdd63b14d2ff237a6293487c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous unknown URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ppa9jkshaqerptkhscbd5ppt93/74073004927.pdf In PDF document text
    • http://toonesk.com/upload/wezuganimozirij.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/rudofifej.pdfIn PDF document text
    • https://atrax.hr/files/tedamosiduvinazufaxidugu.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/jixobadoxofewut.pdfIn PDF document text
    • http://mweb.cz/images/file/sawugelol.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee9395430---kupisan.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/85411273566.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/8220337926.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63409a3e40---pogis.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/3992087335.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/zetubizenikawuditopibo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ada52d3d4---4299448685.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b336e09eb---13497422291.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f373e53cd7---dapazulizeso.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/23235018244.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2gubbpb802ivn3iri2utgn6k0h/94636769768.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0504e98ffd38614a200ecf29fe750c63/7452033290.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5d09df2f---kubotegurozexixi.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/37162185697.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/rodupugabog.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/69677370873.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/7816298376.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jqifuoulv6h5ln9u24ep3algbf/97244342836.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/gvscm0ufk92fc9k2l2tjajipu0/vobakapuxorurada.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fa419e51554dafe06057b8d958cbba74/zujinitozirenamilopozuvo.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/tixatitexebirol.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/powegubafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=answer+phone+with+apple+earbudsPDF 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_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 17304 bytes
SHA-256: 787114fd35084a3b2bcde1479c80a5dd09ece663d08e6c7bb7d5602ba08a6c50
font_01_sfnt_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 10796 bytes
SHA-256: e6a2b3884261ddb1b623f57a1fa57736d9970b4c5dd6eb02b80a76ff9f768195
font_02_sfnt_off0001351a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1