Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffa3dce7a3924a0…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 10:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86a49d6416bd6bdf9e742d46d9fdc97b SHA-1: 259f11d066a1506e15bb95ebe0054d55d2c9a5ba SHA-256: 8ffa3dce7a3924a02bb2ce5213dcd2a2aa33b5f50b27b09c7b2ce6afd5d7f94d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://synerhu.ru/uplcv?utm_term=internal+phone+storage+is+getting+low+samsung+galaxy+ace PDF link annotation
    • https://bearings.vn/images/ckeditor/files/81720047016.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/18487658157.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/tovasenudepolulexumemezig.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/suzazobawusa.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/21599609320.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lnk7gbbu39th7bn2iapohftiq0/44312562177.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/kagulekini.pdfIn PDF document text
    • https://lecachet.fr/docs/files/32950916048.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/vokefenu.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/1660468886.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/zegafi.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/12712859699.pdfIn PDF document text
    • http://gptools.net/userfiles/file/tesubakuz.pdfIn PDF document text
    • http://eichler-kammerer.de/sazilivedorobiruze.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/720dc45d31c549a3b0044d8c0b398f55/bufipe.pdfIn PDF document text
    • http://sushibelovo.ru/files/wogezopuxejexofabelokilo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613441fb6341e---17109578357.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/vajukofukavuxesiw.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/38105535756.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390c8048ec---92199785884.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nipemifolekujudud.pdfIn PDF document text
    • https://orrizon.ru/images/file/bibuwuwamiraluxut.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_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 17840 bytes
SHA-256: 11b0ce038357066edda2290c57fe445a6e4a7be7c8f5f96774574e2bbf0fa711
font_02_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 11172 bytes
SHA-256: d75ee2a38a38a7a7d8c321da04fb53b8e8d09277a666e748240dc7da2af9881b