Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff20c3af29d4ff0e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 09:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3add79e53c4ba259b8daf4b2d14ab838 SHA-1: 694e1143793c0ed7e69a5b85f52a50df74106663 SHA-256: ff20c3af29d4ff0e34d676e94c8b93f9a79664e9199024ebe0efef3677c47232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fsbulletsandbrass.com/userfiles/files/89424008380.pdf In PDF document text
    • http://rfaaa.com/UploadFile/file/20210906074906443.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/vivipusixuxatometovi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132282fecae1---38637341125.pdfIn PDF document text
    • http://safarang.com/basefile/files/muzimozumopexaxitajabepif.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/notiwusinowosofomi.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/kijejexo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13f47e321---22819815726.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/14370651164.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/51081605041.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/lomuvabatizojaxiwanu.pdfIn PDF document text
    • http://freestyler.cz/img/file/voziwigusaxarodutiditalor.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/lelavorufimuj.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/natudivodunovoke.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/84204920778.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/bepupaduxorutaxewaw.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/vowoxitiforekokufame.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/94380709140.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/pupelokodugowexak.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8b84b43f8950da8a575d95a055cd5daf/7806373287.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a336dc912a---vazunudixurepubozizelap.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/fepofa.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/80951048963.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/mobejo.pdfIn PDF document text
    • https://phunhai.net/upload/files/49145847961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=zenul+dialer+contactPDF 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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 18980 bytes
SHA-256: 6a4e6d557676188c0cfb9507d40c5b541466a0b473df0056b74bc4d8d83be139
font_01_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 10260 bytes
SHA-256: 547f8b73d92dda549c5baf5e9ad558d8e026a6a9d5abaa5f9769290d30e650e0
font_02_sfnt_off000130ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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